Gennevilliers (French pronunciation: [ʒœnvilje] ⓘ) is a commune in the northwestern suburbs of Paris, in the Hauts-de-Seine department of Île-de-France.

It is located 9.1 km (5.7 mi) from the centre of Paris.

On 9 April 1929, one-fifth of the territory of Gennevilliers was detached and became the commune of Villeneuve-la-Garenne.

Gennevilliers is served by three stations on Paris Métro Line 13: Les Courtilles, Les Agnettes and Gabriel Péri.

Gennevilliers is also served by two stations on RER C (Les Grésillons and Gennevilliers), as well as five stops on Île-de-France tramway Line 1.