Ashburnham House is an extended seventeenth-century house on Little Dean's Yard in Westminster, London, United Kingdom, which since 1882 has been part of Westminster School. It is occasionally open to the public, when its staircase and first floor drawing-rooms in particular can be seen to be superb. The masonry embrasures in the front room on the ground floor expose the house's mediaeval origins from before the sixteenth-century dissolution of the Monastery, and perhaps from before the Conquest.