| Acronym | Definition |
|---|
| SECO | State Secretariat for Economic Affairs (Bern, Switzerland) |
| SECO | State Energy Conservation Office |
| SECO | Secoisolariciresinol |
| SECO | Sumter Electric Cooperative, Inc. (Florida) |
| SECO | Section Commander (Australia) |
| SECO | Sociedad Española de Cirugía de la Obesidad |
| SECO | Secrétariat d'Etat al'Economie |
| SECO | Sustainer Engine Cut-Off |
| SECO | Sveriges Akademikers Centralorganisation |
| SECO | Second Engine Cut Off |
| SECO | Second Stage Engine Cut Off (aerospace) |
| SECO | Sector Emergency Control Officer |
| SECO | Luciano Secciani and Danielle Conti (Italian company; est. 1979) |
| SECO | Secondary Electron Conduction Orthicon |