| Acronym | Definition |
|---|
| OTTA➣Ohio Tuition Trust Authority (est. 1989) |
| OTTA➣Ontario Truck Training Academy (Oshawa, Ontario, Canada) |
| OTTA➣Ontario Table Tennis Association (Waterloo, Ontario, Canada) |
| OTTA➣Oregon Tow Truck Association (Wilsonville, OR) |
| OTTA➣Oregon Tour and Travel Alliance (Oregon Tourism Commission) |
| OTTA➣Online Tee Time Agent |
| OTTA➣Overwater Test and Training Area |