SQN
| Acronym | Definition |
|---|---|
| SQN | Squadron |
| SQN | Sequence Number |
| SQN | Sine Qua Non |
| SQN | Sequoyah Nuclear Plant (Tennessee) |
| SQN | Société Québécoise de Néphrologie (French: Quebec Nephrology Society; Canada) |
| SQN | School Quota Number (military) |
| SQN | Strange Quark Nugget |