SEIF
| Acronym | Definition |
|---|---|
| SEIF | Sparse Extended Information Filter (autonomous navigation) |
| SEIF | Siondróm Easpa Imdhíonachta Faighte (Irish: AIDS) |
| SEIF | Substance Information Exchange Forum (open database for information on commercial chemicals in the EU) |
| SEIF | Sawteeth-Arm Embracing Internal Fixator (bone healing) |