Saint-Germain-d'Aunay (French pronunciation: [sɛ̃ ʒɛʁmɛ̃ donɛ] ) is a commune in the Orne department in the Normandy region of France with a population of 144 inhabitants (2018).

A manor was built at the end of the 15th century by Guillaume de Mallevouë, knight and lord of the manors of Saint-Germain and Notre-Dame-d'Aulnay. All that is left is the lodge and a bartizan. The majority of the manor was destroyed by the French Catholic League in 1589 and was replaced by a half-timbered building.

In 1822, Saint-Germain-d'Aunay (377 inhabitants in 1821) absorbed Notre-Dame-d'Aunay (123 inhabitants), further to its south. Both villages are shown on the Cassini map of the area.

• Manor in Saint-Germain-d’Aunay a sixteenth century Manor house, that was restored by Victor Ruprich-Robert, it was registered as a Monument historique in 1992. The Manor house was where Henri Breuil wrote most of his work on prehistory in the early 1900s.

• Communes of the Orne department