| Rank | Abbreviation | Meaning |
|---|
| ***** | OTBC | On the Ball City (Norwich City Football Club, UK)
| |
| *** | OTBC | Oulu Thaiboxing Club (Oulu, Finland)
| |
| ** | OTBC | Ocean Terrace Beach Club, Inc. (Palm Beach, Florida)
| |
| ** | OTBC | Open Top Box Culvert
| |
| ** | OTBC | Oxford Terrace Baptist Church (Christchurch, New Zealand)
| |
| * | OTBC | Organ Transplantation Breakthrough Collaborative
| |
| * | OTBC | Organ Transplant Breakthrough Collaborative
| |
| * | OTBC | Occasional Thursday Bridge Club
| |
| * | OTBC | Old Town Baptist Church (Winston-Salem, NC)
| |
| * | OTBC | Off the Beach Catamarans
| |
| * | OTBC | Open Technology Business Center (Beaverton, OR, USA)
| |
| * | OTBC | Open Tech Business Center
| |
| * | OTBC | omeprazole, tetracycline, bismuth and clarithromycin
| |
| * | OTBC | Over the Bars Club (bicycle club)
| |
| * | OTBC | Oregon Technology Business Center
| |
| * | OTBC | Organizations Businesses and City
| |
| * | OTBC | OkTown Bike Crew (Germany)
| |