Companies catalogue
- O'Connor Health Group, Ottawa
- OCCO Kitchen Take Out, Ottawa
- Official Languages and Bilingualism Institute, Ottawa
- Official Super Squad, Ottawa
- Ontario Ministry of Children and Youth Services, Ottawa
- Optimal Health Family Chiropractic & Wellness Centre, Ottawa
- Orbital Talent Inc, Ottawa
- Orleans Chiropractic Clinic, Ottawa
- Orleans Gardens Chiropractic, Ottawa
- Osgoode Baptist and Vernon United Church, Ottawa
- Osgoode Chiropractic Clinic, Ottawa
- Ottawa Agape Chinese Alliance Church, Ottawa
- Ottawa Aihua Chinese Language School-渥太华爱华中文语言学校, Ottawa
- Ottawa Anglican, Ottawa
- Ottawa Billetterie, Ottawa
- Ottawa Centre Communautaires, Ottawa
- Ottawa Centre Communautaires, Ottawa
- Ottawa Centres Communautaires, Ottawa
- Ottawa Centres Communautaires, Ottawa
- Ottawa Children's Clinic, Ottawa
- Ottawa Children's Montessori Center, Ottawa
- Ottawa China Town, Ottawa
- Ottawa Chinese Alliance Church, Ottawa
- Ottawa Chinese Bible Church, Ottawa
- Ottawa Chinese Language School 渥太華中文學校, Ottawa
- Ottawa Chiropractic & Natural Health Centre, Ottawa
- Ottawa Chiropractic Health Clinic, Ottawa
- Ottawa Chiropractic and Sports Injury Clinic, Ottawa
- Ottawa Church Of Christ, Ottawa
- Ottawa Church of Christ, Ottawa
- Ottawa Circus School, Ottawa
- Ottawa Diamond Flooring, Ottawa
- Ottawa Family Chiropractic, Ottawa
- Ottawa Health Connection Prog, Ottawa
- Ottawa Health Group, Ottawa
- Ottawa Pinecrest Complex Comm, Ottawa
- Ottawa Public Library - Beaverbrook, Ottawa
- Ottawa Public Library - Centennial, Ottawa
- Ottawa Public Library - Manotick, Ottawa
- Ottawa Public Library - Nepean Centrepointe, Ottawa
- Ottawa Public Library - Richmond, Ottawa
- Ottawa Public Library - Ruth E. Dickinson, Ottawa
- Ottawa Reformed Presbyterian Church, Ottawa
- Ottawa River of Life Christian Church, Ottawa
- Ottawa River of Life Christian Church, Ottawa
- Ottawa Seventh-Day Adventist Church, Ottawa
- Ottawa Spinal Decompression Center, Ottawa
- Ottawa Valley Vineyard Church, Carleton Place
- Ottawa Vietnamese Alliance Church, Ottawa