Basing House was a Tudor palace and castle in the village of Old Basing in the English county of Hampshire. It once rivalled Hampton Court Palace in its size and opulence. Today only parts of the basement or lower ground floor, plus the foundations and earthworks, remain. The ruins are a Grade II listed building and a scheduled monument.

Old Basing is a village in Hampshire, England, just east of Basingstoke. It was called Basengum in the Anglo-Saxon Chronicle and Basinges in the Domesday Book.