OTCA
| 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 |