Beauty studio in Ohio
1738 results found
Search for local businesses, places and services near you
- United States
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
- Ukraine
- Italy
- Poland
- France
- Germany
-
Merle Norman Cosmetic Studio
● OpenMerle Norman Cosmetic Studio located at 123 South High Street in Hillsboro, Ohio, is a beauty salon and store offering a wide range of services and products. Treat yourself to a spa facial, get your brows shaped, or book a manicure with our skilled technicians. We also offer professional hair removal services and ear piercing in a safe environment. Our studio is a local business, independently owned and operated by Rachelle Trefz, who is dedicated to helping you find the right products for your needs. With a commitment to personalized service and a "Try Before You Buy" philosophy, we ensure your satisfaction. Visit us in Historic Uptown Hillsboro and explore our selection of Merle Norman cosmetics and skincare products.
123 S High St, Hillsboro, OH 45133, United States -
Maria Carmelas Hair Studio LLC
● OpenMaria Carmelas Hair Studio LLC is a premier hair care institution located at 7963 Ohio 123 in Blanchester, Ohio, United States. Our team of skilled stylists and professionals are dedicated to providing top-notch hair care services to our valued clients. From trendy haircuts to stunning hair colors, we offer a wide range of services to help you achieve the perfect look. Visit us today and experience the ultimate pampering and transformation at Maria Carmelas Hair Studio LLC.
7963 OH-123, Blanchester, OH 45107, United States -
Studio Lush Salon
● OpenStudio Lush Salon is a premier beauty salon located in Cincinnati, Ohio. Our team of talented stylists and beauty experts are dedicated to providing top-notch hair care services to our clients. From trendy haircuts and vibrant hair colors to luxurious hair treatments and styling, we offer a wide range of services to help you look and feel your best. Our salon is conveniently located at 6543 Harrison Avenue, making it easily accessible for clients in the Cincinnati area. Step into Studio Lush Salon and let us pamper you with our expert hair care services in a stylish and welcoming atmosphere.
6543 Harrison Ave, Cincinnati, OH 45248, United States -
Studio Salon
● OpenStudio Salon is a premier beauty salon located at 6355 Harrison Avenue in Cincinnati, Ohio. Our talented team of stylists and estheticians offers a wide range of services to help you look and feel your best. From haircuts and color to facials and waxing, we are dedicated to providing top-notch services in a relaxing and welcoming environment. Whether you're looking for a fresh new look or just need some pampering, Studio Salon is the place to go. Book your appointment today and experience the difference for yourself.
6355 Harrison Ave, Cincinnati, OH 45248, United States -
Studio 900
● OpenStudio 900 is a premier beauty salon, hair care, and spa located at 900 Adams Crossing in Cincinnati, Ohio. Our institution is dedicated to providing top-notch services to both our clients and our talented stylists. With a focus on modern style, comfort, and design, Studio 900 offers a luxurious and relaxing environment for all your beauty needs. Whether you're looking for a fresh new haircut, a rejuvenating spa treatment, or a stunning makeover, our team is here to cater to your every need. Come experience the ultimate pampering experience at Studio 900 Salon!
900 Adams Crossing, Cincinnati, OH 45202, United States -
Tiffany's Beauty Studio
● OpenTiffany's Beauty Studio is a premier beauty salon located at 2700 Losantiville Avenue in Cincinnati, Ohio. Our studio offers a wide range of beauty services including hair styling, nail care, skincare treatments, and makeup application. Our team of experienced and talented professionals are dedicated to providing top-notch services in a relaxing and welcoming environment. Whether you're looking for a new hairstyle, a pampering manicure, or a rejuvenating facial, Tiffany's Beauty Studio is the perfect place to indulge in some self-care and enhance your natural beauty. Visit us today and let us help you look and feel your best.
2700 Losantiville Ave, Cincinnati, OH 45213, United States -
Pinnokios Hair Studio
● ClosedPinnokios Hair Studio is a premier beauty salon located at 4178 Hamilton Avenue in Cincinnati, Ohio. Our experienced team of stylists is dedicated to providing top-notch hair care services to our clients. From trendy haircuts and vibrant hair color to luxurious hair treatments and styling, we offer a wide range of services to help you achieve the perfect look. At Pinnokios Hair Studio, we prioritize customer satisfaction and strive to create a relaxing and welcoming atmosphere for all of our guests. Book your appointment today and let us help you achieve your hair goals!
4178 Hamilton Ave, Cincinnati, OH 45223, United States -
You Are So Beautiful Hair Studio
● OpenYou Are So Beautiful Hair Studio is a premier beauty salon located at 7809 Affinity Place in Cincinnati, Ohio. As the owner and hairstylist, I specialize in haircuts, natural styles, and hair extensions. Our studio is dedicated to helping you look and feel your best, with expert services and personalized attention. Whether you're looking for a fresh new haircut, a stunning natural style, or luxurious hair extensions, You Are So Beautiful Hair Studio is the perfect destination for all your beauty needs. Visit us today and let us help you enhance your natural beauty.
7809 Affinity Pl, Cincinnati, OH 45231, United States -
Luxe Doll Studio
● OpenLuxe Doll Studio is a premier beauty salon located at 3657 Stone Creek Boulevard in Cincinnati, Ohio. Our studio offers a wide range of luxurious beauty services to help you look and feel your best. From hair styling and coloring to nail treatments and makeup application, our talented team of professionals is dedicated to providing top-notch service in a relaxing and welcoming environment. Whether you're looking for a fresh new look or just want to pamper yourself, Luxe Doll Studio is the perfect place to indulge in some self-care. Book your appointment today and let us help you unleash your inner beauty.
Salon lofts, 3657 Stone Creek Blvd, Cincinnati, OH 45251, United States -
Studio 914 Hair Salon/ Rhea Pettway
● OpenStudio 914 Hair Salon, owned and operated by Rhea Pettway, is a premier beauty destination located on Compton Road in Cincinnati, Ohio. Specializing in hair care services, our talented team of stylists are dedicated to helping you achieve your desired look. Whether you're looking for a fresh cut, vibrant color, or a stylish updo, we are here to provide top-notch service in a welcoming and relaxing atmosphere. Come visit us at Studio 914 Hair Salon and let us help you look and feel your best.
1612 Compton Rd, Cincinnati, OH 45231, United States -
Jamie's Cutting Studio
● ClosedJamie's Cutting Studio is a premier hair care institution located at 311 Nilles Road in Fairfield, Ohio, United States. Our skilled stylists are dedicated to providing top-notch cutting, styling, and coloring services to help you achieve the perfect look. Whether you're looking for a trendy new haircut or a bold new color, our team is here to make your hair dreams a reality. Come visit us at Jamie's Cutting Studio and leave feeling refreshed and confident with your fabulous new hairstyle.
311 Nilles Rd F, Fairfield, OH 45014, United States -
Tru Beauty Stylez and Collection Studio
● OpenTru Beauty Stylez and Collection Studio is a premier beauty salon located in the heart of Cincinnati, Ohio. Our experienced team of stylists and beauty professionals are dedicated to providing top-notch services to help you look and feel your best. From haircuts and color treatments to makeup application and skincare services, we offer a wide range of beauty services to suit your needs. Visit us at 1725 1/2 Galbraith Road and let us help you achieve your desired look with our expert techniques and high-quality products.
1725 1/2 Galbraith Rd, Cincinnati, OH 45239, United States -
Geez House of Beauty
● OpenWelcome to Geez House of Beauty, a premier beauty salon located at 375 Glensprings Drive in Cincinnati, Ohio. Our expert stylists and beauty professionals are dedicated to providing top-notch hair care and health services to our clients. From haircuts and styling to manicures and facials, we offer a wide range of services to help you look and feel your best. Visit us today and experience the ultimate in pampering and relaxation at Geez House of Beauty.
410 375 Glensprings Dr, Cincinnati, OH 45246, United States -
Thairapy Elite Hair Studio
● OpenThairapy Elite Hair Studio is a premier beauty salon located at 3091 Galbraith Road in Cincinnati, Ohio. Our team of skilled stylists and hair care professionals are dedicated to providing top-notch services to help you achieve your desired look and maintain the health of your hair. Whether you're looking for a trendy new hairstyle, a color refresh, or a relaxing treatment to nourish your locks, Thairapy Elite Hair Studio has you covered. Visit us today and experience the ultimate in hair care and beauty services.
3091 Galbraith Rd, Cincinnati, OH 45239, United States -
Studio K Luxury Salon
● ClosedStudio K Luxury Salon is a premier hair care institution located in the heart of Cincinnati, Ohio. Situated at 1052 Saint Gregory Street, our salon offers a luxurious experience for all your hair care needs. Our team of skilled stylists are dedicated to providing top-notch services, from haircuts and styling to coloring and treatments. Step into Studio K Luxury Salon and treat yourself to a pampering session that will leave you looking and feeling fabulous.
1052 St Gregory St, Cincinnati, OH 45202, United States -
Studio 33 Haircare and Restoration Salon and Clinic
● OpenStudio 33 Haircare and Restoration Salon and Clinic is a premier hair care institution located at 11711 Princeton Pike in Cincinnati, Ohio. Our expert stylists and clinicians offer a wide range of services including haircuts, styling, color treatments, hair restoration, and scalp treatments. Whether you're looking for a new look or need help with hair loss or scalp issues, our team is dedicated to providing top-notch care and personalized solutions for all your hair care needs. Visit us at Studio 33 for a luxurious and rejuvenating experience that will leave you looking and feeling your best.
Salon Lofts, 11711 Princeton Pike suite #22 , #23, Cincinnati, OH 45246, United States -
Em Lash Studio(Define Eyebrows and Eyelashes)inside Evendale walmart
● OpenEm Lash Studio inside Evendale Walmart is a premier beauty salon located at 2801 Cunningham Drive in Cincinnati, Ohio. Specializing in defining eyebrows and enhancing eyelashes, our skilled technicians provide top-quality services to help you achieve your desired look. Whether you're looking for a bold brow or glamorous lashes, our team is dedicated to delivering exceptional results in a comfortable and welcoming environment. Visit us today to experience the ultimate beauty transformation at Em Lash Studio.
Walmart Supercenter, 2801 Cunningham Dr Evendale, 2801 Cunningham Dr, Cincinnati, OH 45241, United States -
The Hairport Barber and Beauty Studio
● OpenThe Hairport Barber and Beauty Studio is a premier beauty salon and hair care destination located at 8466 Vine Street in Cincinnati, Ohio. Our skilled team of professionals offers a wide range of services to help you look and feel your best, including haircuts, styling, coloring, and treatments. Whether you're looking for a fresh new look or just need a trim, our experienced staff is here to help. Visit us today and experience the difference at The Hairport Barber and Beauty Studio.
8466 Vine St, Cincinnati, OH 45216, United States -
Heaven's Glow Beauty Studio
● OpenHeaven's Glow Beauty Studio is a luxurious beauty salon and hair care center located at 7610 Reading Road in Cincinnati, Ohio. Our skilled team of stylists and beauty experts are dedicated to helping you achieve a radiant and glowing look that will make you feel like you're walking on air. From haircuts and color treatments to facials and makeup application, we offer a wide range of services to help you look and feel your best. Come visit us at Heaven's Glow Beauty Studio and let us help you shine bright like a diamond.
7610 Reading Rd Suite 100 Room 2, Cincinnati, OH 45237, United States -
Inception Hair Studio
● OpenWelcome to Inception Hair Studio, located at 5502 Carthage Avenue in Cincinnati, Ohio. As a beauty salon, we are dedicated to helping you achieve a look that truly represents you. We take pride in our craft and the products we use, including the Decca Hair Care System available in our retail section. Our goal is to provide our clients with the best possible results, both in the salon and at home. At Inception Hair Studio, we offer a cozy and clean space for you to relax and enjoy your service. To ensure a peaceful environment for all of our clients, we kindly ask that no children are brought to the salon unless they are receiving a service. Additionally, we request that no extra people accompany you to your appointment.
5502 Carthage Ave, Cincinnati, OH 45212, United States -
Rituals Beauty Studio
● OpenRituals Beauty Studio is a premier beauty salon located in Cincinnati, Ohio. Our studio offers a wide range of services, including hair care, skincare, and health treatments. Our team of experienced professionals is dedicated to providing top-quality services in a relaxing and welcoming environment. Whether you're looking for a new hairstyle, a rejuvenating facial, or a soothing massage, Rituals Beauty Studio has you covered. Visit us at 3612 Marburg Avenue and experience the ultimate pampering experience.
3612 Marburg Ave, Cincinnati, OH 45208, United States -
Dionne's Hair Studio
● OpenDionne's Hair Studio is a premier beauty salon located at 4916 Reading Road in Cincinnati, Ohio. Our team of experienced stylists is dedicated to providing top-notch hair services, including cuts, colors, and treatments, to help you achieve your desired look. Whether you're looking for a trendy new style or a classic cut, our talented staff will work with you to create a customized look that suits your individual needs and preferences. Visit Dionne's Hair Studio today and experience the ultimate in hair care and styling services.
4916 Reading Rd, Cincinnati, OH 45237, United States -
Luxe Beauty Studio
● OpenLuxe Beauty Studio is a premier beauty salon located at 7617 Reading Road in Cincinnati, Ohio. Our team of experienced and talented professionals are dedicated to providing top-notch beauty services to help you look and feel your best. From haircuts and styling to manicures, pedicures, and skincare treatments, we offer a wide range of services to cater to all of your beauty needs. Visit Luxe Beauty Studio for a luxurious and relaxing experience that will leave you feeling refreshed and rejuvenated.
7617 Reading Rd Suite 100, Cincinnati, OH 45237, United States -
Flair Hair Studio
● OpenFlair Hair Studio is a premier beauty salon located at 6085 Montgomery Road in Cincinnati, Ohio. Our talented team of stylists are dedicated to providing top-notch hair services, from cuts and coloring to styling and treatments. With a modern and inviting atmosphere, clients can relax and enjoy a personalized experience tailored to their unique needs and preferences. Whether you're looking for a fresh new look or simply wanting to maintain your current style, Flair Hair Studio is the perfect destination for all your hair care needs. Visit us today and let us help you achieve the fabulous hair you've always dreamed of.
6085 Montgomery Rd, Cincinnati, OH 45213, United States -
ELITE STUDIOS BEAUTY
● OpenElite Studios Beauty is a premier beauty salon located in the heart of Cincinnati, Ohio. Our team of highly skilled and experienced beauty professionals are dedicated to providing top-notch services to help our clients look and feel their best. From hair styling and coloring to facials, waxing, and makeup application, we offer a wide range of services to cater to all of your beauty needs. Our modern and stylish salon provides a relaxing and welcoming atmosphere for clients to enjoy a pampering experience. Visit us at 6647 Montgomery Road to indulge in luxury beauty treatments and leave feeling like a true elite.
6647 Montgomery Rd suite C, Cincinnati, OH 45213, United States -
Bungalow Beauty & Wellness
● ClosedAt Bungalow Beauty & Wellness, located in Cincinnati, Ohio, you can experience the perfect combination of beauty and wellness services. Our multi-esthetician skincare studio offers a range of services including hair care, nail services, and massages to help you look and feel your best. Owners Leah and Erin are dedicated to providing a relaxing and rejuvenating experience for each client. Visit us at 4790 Red Bank Expressway, Suite 126 and let us help you achieve your beauty and wellness goals.
4790 Red Bank Expy #126, Cincinnati, OH 45227, United States -
IAMTASIA.P HAIR STUDIO LLC
● OpenIAMTASIA.P HAIR STUDIO LLC is a premier beauty salon located in Cincinnati, Ohio, United States. Our studio offers a wide range of hair services including cuts, color, styling, and treatments. Our skilled and experienced stylists are dedicated to providing top-notch service and creating beautiful, customized looks for each of our clients. Whether you're looking for a simple trim or a complete hair transformation, IAMTASIA.P HAIR STUDIO LLC is the perfect place to pamper yourself and enhance your natural beauty. Visit us at 31 Triangle Park Drive and let us help you achieve the hair of your dreams.
31 Triangle Park Dr SUITE. 3105, Cincinnati, OH 45246, United States -
Dawns Hair Studio
● OpenDawns Hair Studio is a premier hair care institution located at 9274 Centre Pointe Drive in Ohio, United States. Our skilled team of stylists are dedicated to providing top-notch hair services to help you achieve the perfect look. From cuts and colors to styling and treatments, we offer a wide range of services to cater to all your hair care needs. Visit us today and experience the expertise and professionalism that sets us apart from the rest.
9274 Centre Pointe Dr, West Chester Township, OH 45069, United States -
Skin Concept Studio
● OpenSkin Concept Studio is a premier beauty salon located in Olde West Chester, Ohio. Our expert team of professionals is dedicated to providing top-notch skincare services to help our clients achieve healthy, radiant skin. From facials and peels to waxing and microdermabrasion, we offer a wide range of treatments tailored to meet your specific needs. Visit us at 8859 Cincinnati Dayton Road to experience the ultimate pampering and rejuvenation for your skin.
8859 Cincinnati Dayton Rd #001, West Chester Township, OH 45069, United States -
Celine Thiel Hair Studio
● OpenCeline Thiel Hair Studio is a premier beauty salon located in Cincinnati, Ohio. Our talented team of hairstylists and beauty professionals are dedicated to providing top-notch services to help you look and feel your best. From haircuts and color treatments to styling and makeup services, we offer a wide range of options to suit your individual needs. Visit us at 2435 Williams Avenue for a luxurious and relaxing experience that will leave you feeling pampered and refreshed.
2435 Williams Ave, Cincinnati, OH 45212, United States
- Beauty studio in Akron
- Beauty studio in Alliance
- Beauty studio in Amelia
- Beauty studio in Amherst
- Beauty studio in Andover
- Beauty studio in Archbold
- Beauty studio in Ashtabula
- Beauty studio in Austintown
- Beauty studio in Avon
- Beauty studio in Avon Lake
- Beauty studio in Barberton
- Beauty studio in Beachwood
- Beauty studio in Beavercreek
- Beauty studio in Beckett Ridge
- Beauty studio in Bellaire
- Beauty studio in Bellefontaine
- Beauty studio in Berea
- Beauty studio in Blue Ash
- Beauty studio in Boardman
- Beauty studio in Bowling Green
- Beauty studio in Brecksville
- Beauty studio in Broadview Heights
- Beauty studio in Brunswick
- Beauty studio in Bryan
- Beauty studio in Cambridge
- Beauty studio in Canal Fulton
- Beauty studio in Canfield
- Beauty studio in Canton
- Beauty studio in Carrollton
- Beauty studio in Celina
- Beauty studio in Centerville
- Beauty studio in Chagrin Falls
- Beauty studio in Chardon
- Beauty studio in Cincinnati
- Beauty studio in Cleveland
- Beauty studio in Cleveland Heights
- Beauty studio in Coldwater
- Beauty studio in Columbiana
- Beauty studio in Columbus
- Beauty studio in Conneaut
- Beauty studio in Cortland
- Beauty studio in Cuyahoga Falls
- Beauty studio in Dayton
- Beauty studio in Defiance
- Beauty studio in Delaware
- Beauty studio in Delphos
- Beauty studio in Dublin
- Beauty studio in East Liverpool
- Beauty studio in East Palestine
- Beauty studio in Eastlake
- Beauty studio in Eaton
- Beauty studio in Elyria
- Beauty studio in Englewood
- Beauty studio in Euclid
- Beauty studio in Fairborn
- Beauty studio in Fairfield
- Beauty studio in Fairlawn
- Beauty studio in Fairview Park
- Beauty studio in Findlay
- Beauty studio in Fort Recovery
- Beauty studio in Franklin
- Beauty studio in Fremont
- Beauty studio in Gallipolis
- Beauty studio in Georgetown
- Beauty studio in Germantown
- Beauty studio in Girard
- Beauty studio in Greenville
- Beauty studio in Grove City
- Beauty studio in Hamilton
- Beauty studio in Harrison
- Beauty studio in Hartville
- Beauty studio in Hicksville
- Beauty studio in Hilliard
- Beauty studio in Hillsboro
- Beauty studio in Holland
- Beauty studio in Hubbard
- Beauty studio in Huber Heights
- Beauty studio in Hudson
- Beauty studio in Independence
- Beauty studio in Ironton
- Beauty studio in Jackson
- Beauty studio in Jefferson
- Beauty studio in Kent
- Beauty studio in Kenton
- Beauty studio in Kettering
- Beauty studio in Lakewood
- Beauty studio in Lebanon
- Beauty studio in Lima
- Beauty studio in Lisbon
- Beauty studio in London
- Beauty studio in Lorain
- Beauty studio in Loveland
- Beauty studio in Lyndhurst
- Beauty studio in Madison
- Beauty studio in Maineville
- Beauty studio in Marietta
- Beauty studio in Marion
- Beauty studio in Martins Ferry
- Beauty studio in Marysville
- Beauty studio in Mason
- Beauty studio in Massillon
- Beauty studio in Maumee
- Beauty studio in Mayfield Heights
- Beauty studio in Medina
- Beauty studio in Mentor
- Beauty studio in Miamisburg
- Beauty studio in Middleburg Heights
- Beauty studio in Middlefield
- Beauty studio in Middletown
- Beauty studio in Milford
- Beauty studio in Monroe
- Beauty studio in Montgomery
- Beauty studio in Montpelier
- Beauty studio in Moraine
- Beauty studio in Mount Orab
- Beauty studio in Napoleon
- Beauty studio in New Carlisle
- Beauty studio in New Philadelphia
- Beauty studio in Niles
- Beauty studio in North Canton
- Beauty studio in North Olmsted
- Beauty studio in North Ridgeville
- Beauty studio in North Royalton
- Beauty studio in Norton
- Beauty studio in Norwalk
- Beauty studio in Oberlin
- Beauty studio in Oregon
- Beauty studio in Orrville
- Beauty studio in Ottawa
- Beauty studio in Oxford
- Beauty studio in Painesville
- Beauty studio in Parma
- Beauty studio in Parma Heights
- Beauty studio in Paulding
- Beauty studio in Perrysburg
- Beauty studio in Piqua
- Beauty studio in Plain City
- Beauty studio in Poland
- Beauty studio in Portsmouth
- Beauty studio in Powell
- Beauty studio in Proctorville
- Beauty studio in Ravenna
- Beauty studio in Rocky River
- Beauty studio in Saint Clairsville
- Beauty studio in Saint Marys
- Beauty studio in Salem
- Beauty studio in Sandusky
- Beauty studio in Sheffield
- Beauty studio in Sidney
- Beauty studio in Solon
- Beauty studio in South Euclid
- Beauty studio in South Point
- Beauty studio in Springboro
- Beauty studio in Springdale
- Beauty studio in Springfield
- Beauty studio in Steubenville
- Beauty studio in Stow
- Beauty studio in Streetsboro
- Beauty studio in Strongsville
- Beauty studio in Struthers
- Beauty studio in Swanton
- Beauty studio in Sylvania
- Beauty studio in Tallmadge
- Beauty studio in Tiffin
- Beauty studio in Tipp City
- Beauty studio in Toledo
- Beauty studio in Trenton
- Beauty studio in Trotwood
- Beauty studio in Troy
- Beauty studio in Twinsburg
- Beauty studio in Uniontown
- Beauty studio in Upper Sandusky
- Beauty studio in Urbana
- Beauty studio in Van Wert
- Beauty studio in Vandalia
- Beauty studio in Vermilion
- Beauty studio in Wadsworth
- Beauty studio in Wapakoneta
- Beauty studio in Warren
- Beauty studio in Washington Court House
- Beauty studio in Wauseon
- Beauty studio in Waverly
- Beauty studio in Waynesville
- Beauty studio in West Union
- Beauty studio in Westlake
- Beauty studio in Wickliffe
- Beauty studio in Willoughby
- Beauty studio in Willoughby Hills
- Beauty studio in Wilmington
- Beauty studio in Wintersville
- Beauty studio in Wooster
- Beauty studio in Xenia
- Beauty studio in Yellow Springs
- Beauty studio in Youngstown
List of local businesses, places and services in Ohio
⭐ business help 🔍 services ☎ phones 🕒 opening times ✍️reviews 🌍 addresses, locations 📷 photos