OB
| Abbreviation | Meaning | Tamil Meaning | Category |
|---|---|---|---|
| OB | Onboard | - | Organizations |
| OB | Operational Base | - | Organizations |
| OB | Outboard | - | Organizations |
| OB | Obligatory | - | ISO Country Codes |
| OB | Obedience - Obligation - Obligatory - Obsolete - Obstetrics -Ocean Beach (California) - Off Break (cricket) - Old Bryanstonian - Order Of Battle - Outlet Box (electrical) -Overbought (stock Market) -Oversight Board | - | Astronomy |
| OB | Obiit (Latin | - | Astronomy |
| OB | Optical Bench | - | Business and Finance |