O - brands for women
- O'Neill
- OAD
- Oakley
- OAS
- OASIS SOCIETY
- OAT COLLECTIVE
- Oat New York
- Obermeyer
- Oboz
- Ocean Drive
- Oddmuse
- Odeeh
- Odi Et Amo
- ODI ODI
- Odissi
- Off-White
- Off-White™
- Officine Creative
- Officine Generale
- Offline
- Oh La La Cheri
- Oh My Gauze
- Oh My Goat
- Oh My Stars Apparel
- Oh Polly
- Ola Azul
- Old Friend Footwear
- OLD GRINGO
- Old Ranch
- Old Soles
- Oleg Cassini
- OLEM
- Olga Berg
- Oli & Hali
- Oliphant
- OLIVACEOUS
- Olive & Pique
- Olive Surf
- Olive Workshop
- OLIVER & OTIS
- OLIVER HORIGAMY
- Oliver Lattughi
- Oliver Logan
- Oliver Peoples
- Oliver Tweed
- Oliver Tweed Infinity Leather
- Olivia By Habitat
- Olivia By Livro
- Olivia James The Label
- Olivia Rubin
- Olivia Taylor
- Olivia Von Halle
- Ollari
- Ollu
- OLOEY
- OluKai
- Olympia Le-Tan
- Omika
- On
- On Gossamer
- ON RUNNING
- On The Plus Side
- Oncept
- One & Only
- ONE 33 SOCIAL
- One And Only Collective
- One Essence
- One Of These Days
- One Teaspoon
- Onebuye
- ONEONE
- OneOne Swimwear
- ONEX
- OnFoot
- Onia
- Only Hearts
- Onna
- Onzie
- OOFOS
- OOFWEAR
- Ooh La
- Oolala
- Opening Ceremony
- OpéraSPORT
- OPI
- OPT
- Optic Nerve
- OPTIXX
- Orange Fashion Village
- Orchid Bloom
- Orciani
- Orientique
- Origami
- Orlebar Brown
- ORLY
- Orniya
- OROTON
- OrthoFeet
- Ortovox
- Orvis
- Oryany
- Osamore
- Oscar De La Renta
- Oscar The Collection
- OSEREE
- OSIS
- OSOI
- Ossou
- OTBT
- Otto
- Ottod'ame
- Ottolinger
- Oui
- Our Legacy
- Outerknown
- Outland Denim
- Outwoods
- Oval Square
- Ovye
- OW
- OW Collection
- Ownley
- Ozai N Ku