| OTB | Object Time Base 
| Others |
| OTB | Oceanography Teaching Building
| Others |
| OTB | Off the Back
| Others |
| OTB | Off The Beat
| Others |
| OTB | Off The Board
| Others |
| OTB | Off The Broiler
| Others |
| OTB | Off To Bed
| Others |
| OTB | Off Track Betting
| Others |
| OTB | Off Track Bettingotb
| Others |
| OTB | Off Trial Balance
| Others |
| OTB | Offer To Beat
| Others |
| OTB | Offer To Buy
| Others |
| OTB | Office of Tony Blair
| Others |
| OTB | Oldsmobile Toronado Brougham
| Others |
| OTB | On Target Bonus
| Others |
| OTB | On The Ball
| Others |
| OTB | On the Beach
| Others |
| OTB | On The Block
| Others |
| OTB | On The Blokk
| Others |
| OTB | On The Board
| Others |
| OTB | On The Boards
| Others |
| OTB | On The Border
| Others |
| OTB | On The Button
| Others |
| OTB | On Time Bonus
| Others |
| OTB | On-Time Bonus
| Others |
| OTB | One Term Blunt
| Others |
| OTB | One Touch Back
| Others |
| OTB | One Touch Backup
| Others |
| OTB | One Trashy Beeeoottch
| Others |
| OTB | Only The Best
| Others |
| OTB | Only The Brave
| Others |
| OTB | Only The Burnt
| Others |
| OTB | Ontario Trillium Benefit
| Others |
| OTB | Open To Below
| Others |
| OTB | Open To Buy
| Others |
| OTB | Open Training B
| Others |
| OTB | Operant Test Battery
| Others |
| OTB | Opportunity to Ballot
| Others |
| OTB | Option To Buy
| Others |
| OTB | Orbital Test Bed
| Others |
| OTB | Orbiting Tanker Base
| Others |
| OTB | Order To Build
| Others |
| OTB | Oregon Tech Broadcasting
| Others |
| OTB | Orix Trust and Banking
| Others |
| OTB | Out Of The Boxotb
| Others |
| OTB | Outside The Beltway
| Others |
| OTB | Outside The Box
| Others |
| OTB | Over The Bar
| Others |
| OTB | Over The Bars
| Others |
| OTB | Over The Beach
| Others |
| OTB | Over The Board
| Others |
| OTB | Over The Bridge
| Others |
| OTB | Over Thirty Baseball
| Others |
| OTB | Over-The-Board
| Others |
| OTB | Owning The Best
| Others |
| OTB | Subaru Outback
| Others |