Gometz-le-Châtel (French pronunciation: [ɡɔmɛs lə ʃɑtɛl] ⓘ) is a commune in the Essonne department of France.

This village is near Les Ulis, Bures-sur-Yvette, Gif-sur-Yvette and Gometz-la-Ville, along the old road from Paris to Chartres, crossing the Hurepoix.

The average annual rainfall is 734.7 mm (28.93 in) with December as the wettest month.

The temperatures are highest on average in July, at around 19.3 °C (66.7 °F), and lowest in January, at around 4.1 °C (39.4 °F).

Inhabitants of Gometz-le-Châtel are called Castelgometziens in French.