| Acronym | Definition |
|---|
| SECA | Solid State Energy Conversion Alliance |
| SECA | Swiss Private Equity & Corporate Finance Association |
| SECA | Southern Early Childhood Association |
| SECA | Southern Europe and Central Asia (various organizations) |
| SECA | Sulphur Emission Control Area |
| SECA | Society for the Encouragement of Contemporary Art (San Francisco Museum of Modern Art; California) |
| SECA | SOx Emission Control Area |
| SECA | Stato Ecologico Dei Corsi d'Acqua (ecology, Italy) |
| SECA | South East Clown Association (North Carolina, USA) |
| SECA | Support Equipment Controlling Authority |
| SECA | Self-Employment Contributions Act of 1954 |
| SECA | State Employees Commuter Association (Albuquerque, NM) |