Sunninghill is a village in the civil parish of Sunninghill and Ascot in the Royal Borough of Windsor and Maidenhead in the English county of Berkshire.

The Royal Borough of Windsor and Maidenhead is a royal borough and unitary authority in Berkshire, South East England. While it is named after both the towns of Maidenhead and Windsor, the borough also covers the nearby towns of Ascot and Eton. It is home to Windsor Castle, Eton College, Legoland Windsor and Ascot Racecourse. It is one of four boroughs entitled to be prefixed Royal and is one of six unitary authorities in the county, which has historic and ceremonial status.