Crouy-en-Thelle () is a commune in the Oise department in northern France.
As of 2019, there are 415 dwellings in the commune, of which 399 primary residences.
Crouy-en-Thelle's elevation ranges between and above sea level. Its area is . The town is 3 km east of Neuilly-en-Thelle, and 8 km northeast of Persan.