Choisy-le-Roi (; 'Choisy-the-King') is a commune in the Val-de-Marne department, in the southeastern suburbs of Paris, France.
The current Hôtel de Ville was completed in 1988.
Choisy-le-Roi is located southeast from the center of Paris, on both banks of the river Seine. The neighbouring communes are, from the north and clockwise: Vitry-sur-Seine, Alfortville, Créteil, Valenton, Villeneuve-Saint-Georges, Orly and Thiais.
Choisy-le-Roi has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Choisy-le-Roi is . The average annual rainfall is with December as the wettest month. The temperatures are highest on average in July, at around , and lowest in January, at around . The highest temperature ever recorded in Choisy-le-Roi was on 25 July 2019; the coldest temperature ever recorded was on 1 January 1997.
Choisy-le-Roi is served by Choisy-le-Roi station on Paris RER line C. It is also served by Créteil-Pompadour station on Paris RER line D.
Public schools include:
There is a private school serving elementary to senior high school, groupe scolaire Saint André Choisy-le-Roi.
Choisy-le-Roi is twinned with: