Ishøj Municipality (Danish: Ishøj Kommune) is a municipality (Danish: kommune) in the Capital Region on the island of Zealand (Sjælland) in eastern Denmark.

Its mayor is Merete Amdisen, a member of the Social Democrats (Socialdemokraterne) political party.

55.8% has a Danish-background, 16.3% Turkish, 5.6% Pakistani and 22.3% have another background (Polish, Nepali, Iraqi, Romanian, Indian, Moroccan and Bulgarian, among others).

Neighboring municipalities are Vallensbæk to the east, Høje-Taastrup to the north and west, and Greve to the south.

Ishøj's municipal council consists of 19 members, elected every four years.