| Acronym | Definition |
|---|
| THEMIS | Thermal Emission Imaging System (Mars Odyssey Mission) |
| THEMIS | Time History of Events and Macroscale Interactions During Substorms (NASA satellite) |
| THEMIS | Tracking Humans for the Evaluation of their Motion in Image Sequences (International Workshop) |
| THEMIS | Télescope Héliographique pour l'Etude du Magnétisme et des Instabilités Solaires (French) |
| THEMIS | Thematic Network in Optimising the Management of Intermodal Transport Services (rail transport) |
| THEMIS | Institute for Quality and Efficiency in Tourism Education and Training |