- O'Halloran Cordova, Cathleen - Designer educated at Pratt Institute, owner and chief designer of O'Halloran Co, which creates apparel, accessories, home décor and gift items for and inspired by equestrian and country life, including riding apparel and horse care merchandise. Site includes bio, company background, collections, press clippings, online shopping and contact information.
- Okamura, Malia - San Diego based creator of the Miyo Design collection of one of a kind, handmade handbags and accessories. Site includes background information and online shopping.
- Ooglie - Design house specializing in t-shirts and jewelry, based in Toronto. Site includes company background, contact information, collections, online shopping, staff bios, and events.