Saint-Germain-sous-Cailly (, literally Saint-Germain under Cailly) is a commune in the Seine-Maritime department in the Normandy region in north-western France.
Its castle was the burial place of Ogier Ghiselin de Busbecq.
A small farming village situated by the banks of the Cailly in the Pays de Bray, some northeast of Rouen on the D44 road.