Maidenhead is a market town in the Royal Borough of Windsor and Maidenhead in the county of Berkshire, England, on the southwestern bank of the River Thames. In the 2021 Census, it had an estimated population of 70,374 and forms part of the border with southern Buckinghamshire. The town is situated 27 miles (43 km) west of Charing Cross, London and 13 miles (21 km) east-northeast of the county town of Reading. The town differs from the Parliamentary constituency of Maidenhead, which includes a number of outer suburbs and villages, including villages which form part of the Borough of Wokingham such as Twyford, Charvil, Remenham, Ruscombe and Wargrave.

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.