Bois-Guillaume is a commune in the Seine-Maritime department in the Normandy region in northern France. The town is a wealthy, residenti…Bois-Guillaume is a commune in the Seine-Maritime department in the Normandy region in northern France. The town is a wealthy, residential hilltop suburb of Rouen, semi-rural, semi-suburban with a little farming and some light industry. It is considered part of Greater Rouen, being just five kilometres to the northeast, at the junction of the D43 and the D928 roads.