| Ségny | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Segny 01.svg |
| Arrondissement: | Gex |
| Canton: | Thoiry |
| Insee: | 01399 |
| Postal Code: | 01170 |
| Mayor: | Jean-Pierre Fouilloux[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Pays de Gex |
| Coordinates: | 46.2969°N 6.0736°W |
| Elevation M: | 479 |
| Elevation Min M: | 467 |
| Elevation Max M: | 519 |
| Area Km2: | 3.24 |
Ségny (pronounced as /fr/), also written Segny, is a commune in the Ain department in eastern France.
Ségny is situated in the east of the department, in a district of the Lake Geneva / River Rhône basin known as the Pays de Gex. It lies on the important RN 5 trunk road from Paris to Geneva and is just five minutes by road from Geneva Cointrin International Airport. A local bus service connects Ségny to Geneva city centre, which is some 13km (08miles) away.
Ségny became a member of the Pays de Gex Community of Communes on 1 January 1996. The commune is bordered by Cessy to the north, Versonnex to the east, Prévessin-Moëns and Ornex to the south, and Échenevex and Chevry to the west.