| Acronym | Definition |
|---|
| OTCA➣Organização do Tratado de Cooperação Amazônica (Portuguese: Amazon Cooperation Treaty Organization) |
| OTCA➣Old Town Commercial Association (Lansing, MI) |
| OTCA➣Overseas Technical Cooperation Agency (est. 1962; Japan) |
| OTCA➣Ottawa Tourism and Convention Authority (Canada) |
| OTCA➣Omnibus Trade and Competitiveness Act of 1988 |
| OTCA➣Office of Technical and Customer Assistance (Rhode Island) |
| OTCA➣L-2-oxothiazolidine-4-carboxylic acid |