Cainhoe Castle is an 11th-century Norman motte and triple bailey castle located near Clophill in Bedfordshire, England. Built by Nigel d'Aubigny following the Norman Conquest, the castle served as the seat of the Barony of Cainhoe and remained in the d'Aubigny family until 1272. Occupied continuously until the Black Death in 1348, it fell into ruin by 1374 and was abandoned. Archaeological excavations in 1973, 1985, and 1986 revealed earthworks and associated features. Today, Cainhoe Castle is a Scheduled Monument, designated since 1929, and stands as a rare surviving example of Norman motte-and-bailey construction preserved as archaeological earthworks.