OTTA
| 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 |