Aignan (French pronunciation: [ɛɲɑ̃] ⓘ; Gascon: Anhan [aˈɲa]) is a commune located in the west of the Gers department in the region of Occitania.

It is a rural community with 726 inhabitants as of 2019, down from a peak of 1,771 in 1831.

The name Aignan comes from the Latin "Annius" followed by the suffix "anum", which likely refers to the region's owner during the period of Roman Gaul.

Aignan is located in the canton of Adour-Gersoise and in the arrondissement of Mirande.

This Gers geographical article is a stub.