| Acronym | Definition |
|---|
| OpBA➣Opponents Batting Average (baseball) |
| OpBA➣Offshore Powerboat Association |
| OpBA➣Offshore Power Boat Association |
| OpBA➣Operations Per Based Aircraft |
| OpBA➣Ohio Poultry Breeders Association |
| OpBA➣Ontario Public Buyers Association, Inc. |
| OpBA➣Ontario Professional Basketball Association (Canada) |
| OpBA➣Oceania Pocket Billiard Association |
| OpBA➣Ohio Patrolmen's Benevolent Association |
| OpBA➣Ogden Police Benefit Association (Utah) |
| OpBA➣Ontario Pension Benefits Act (Canada) |
| OpBA➣Old Pueblo Business Alliance |
| OpBA➣Ohio Proficiency-Based Assessment |
| OpBA➣Orlando Police Benevolent Association (Florida) |
| OpBA➣Old Pueblo Bass Anglers (Tucson, AZ) |
| OpBA➣Ohio Pawnbrokers Association |
| OpBA➣Ontario Pinzgauer Breeders Association (Canada) |
| OpBA➣Order of the Palm of the Barony of Atenveldt |
| OpBA➣Occupational Pension Benefits Act (Barbados) |
| OpBA➣Open Barrel |