Rambouillet, town (1990 pop. 25,293), Yvelines dept., N France. It is a summer resort in the heart of a magnificent forest. Sheep are raised, and radio equipment and plastics are made. The nearby château (14th–18th cent.), set in a beautiful park, is the official summer residence of French presidents, and the vast forest is used for official hunting parties. A national farm there was established by Louis XVI.