| Acronym | Definition |
|---|
| SESI | Servico Social da Industria (Brazil) |
| SESI | Solar Energy Society of India (est. 1976; International Solar Energy Society) |
| SESI | Science and Engineering Services, Inc. (various locations) |
| SESI | Superior Energy Services, Inc. (various locations) |
| SESI | Systems Engineering Solutions, Inc. (est. 1987; Dunn Loring, VA) |
| SESI | Social Entrepreneurship Summer Institute (Illinois) |
| SESI | Systemes d´Enseignement Superieur et Innovation (French: Systems of Innovation and Higher Education) |
| SESI | Shipboard Explosive Safety Inspection |