Gers (French pronunciation: [ʒɛʁ(s)]; Occitan: Gers or Gerç, [dʒɛɾs]) is a department in the region of Occitania, Southwestern France. Gers is bordered by the departments of Hautes-Pyrénées and Pyrénées-Atlantiques to the south, Haute-Garonne and Tarn-et-Garonne to the east, Lot-et-Garonne to the north and Landes to the west. Named after the Gers River, its inhabitants are called the Gersois and Gersoises in French. In 2019, it had a population of 191,377.

In the Middle Ages, the Lordship of L'Isle-Jourdain was nearby.

Gers is one of the original 83 departments created during the French Revolution on 4 March 1790. It was created from parts of the former provinces of Guyenne and Gascony. In 1808 it lost Lavit on its north-eastern side to the newly created department of Tarn-et-Garonne.

The culture is largely agricultural, with great emphasis on the local gastronomical specialties such as:

Also, some prominent cultivated crops are Maize, colza, sunflowers and grain.

The Gascon language is a dialect of Occitan, but it is not widely spoken. The department is characterised by sleepy bastide villages and rolling hills with the Pyrenees visible to the south. Alexandre Dumas, père created the famous Gersois d'Artagnan, the fourth musketeer of The Three Musketeers. A museum to d'Artagnan is found in the Gersois village of Lupiac.

A horse race at the Auteuil Hippodrome has been named after André Boingnères, a notable local race-horse owner and the successful Mayor of Termes-d'Armagnac between 1951 and 1976.

The President of the Departmental Council of Gers is Philippe Dupouy of the Socialist Party since 2022. He succeeded Philippe Martin, who had been in office since 2014. The assembly comprises 34 seats, allocated as follow since the 2015 departmental elections: