| Acronym | Definition |
|---|
| OTPA➣Ought to Pass with Amendment (New Hampshire) |
| OTPA➣Old Towne Preservation Association (Orange, CA) |
| OTPA➣Office of Tax Policy Analysis (various locations) |
| OTPA➣One Time Password Authentication |
| OTPA➣Out-of-Turn Plan Amendment |
| OTPA➣Optically-Tuned Patch Antenna |
| OTPA➣Office of Technology and Policy Analysis (US DOC) |