Castine-en-Plaine (, literally Limestone in Plain) is a commune in the Calvados department in northwestern France. The municipality was established on 1 January 2019 by merger of the former communes of Hubert-Folie, Rocquancourt and Tilly-la-Campagne.
The commune is made up of the following collection of villages and hamlets, Hubert-Folie, Rocquancourt and Castine-en-Plaine.