Ségny (French pronunciation: [seɲi]), 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 13 km (8.1 mi) 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.

Historical population

Year Pop. ±% p.a. 1793 221 —     1800 432 +10.05% 1806 261 −8.06% 1821 253 −0.21% 1831 311 +2.09% 1836 328 +1.07% 1841 316 −0.74% 1846 280 −2.39% 1851 282 +0.14% 1856 270 −0.87% 1861 264 −0.45% 1866 284 +1.47% 1872 292 +0.46% 1876 300 +0.68% 1881 289 −0.74% 1886 275 −0.99% 1891 253 −1.65% 1896 235 −1.47%	Year Pop. ±% p.a. 1901 257 +1.81% 1906 237 −1.61% 1911 249 +0.99% 1921 250 +0.04% 1926 239 −0.90% 1931 216 −2.00% 1936 217 +0.09% 1946 201 −0.76% 1954 223 +1.31% 1962 279 +2.84% 1968 449 +8.25% 1975 783 +8.27% 1982 1,002 +3.59% 1990 1,211 +2.40% 1999 1,348 +1.20% 2007 1,536 +1.65% 2012 1,762 +2.78% 2017 2,062 +3.19%
Source: EHESS and INSEE (1968-2017)

• Communes of the Ain department