| Acronym | Definition |
|---|
| TESN | Tema di Studio Nazionale (Italian: Theme of National Study) |
| TESN | Telestone Technologies (China) |
| TESN | Transition to Employment Services for Newcomer (Canada) |
| TESN | Tetraethyl Tin |
| TESN | Tertiary Education Security Network (various locations) |
| TESN | Travail à l'Eau et Sauvetage Nautique (French: Work on Water and Rescue Boat) |
| TESN | Toyota Escondido Sports Network (Escondido, CA) |
| TESN | Tragic Events Support Network (Humber College; Canada) |
| TESN | Test de Evaluación del Sintagma Nominal (Spanish: Assessment Test Noun Phrase) |