Marlow, town (parish), Wycombe district, administrative and historic county of Buckinghamshire, southeastern England. It lies on the River Thames.
The parish Church of All Saints was built in 1835 on the site of a church that dated from the 12th century. The Sir William Borlase’s Grammar School was founded at Marlow in 1624. Marlow Place (1720) was built for George II (reigned 1727–60) when he was prince of Wales. Remnantz House contained the English Royal Military College from 1802 to 1812. Marlow is a residential town, but in summer its boating facilities and regatta attract visitors. Medmenham Abbey, about 3 miles (5 km) southwest, was built on the site of a Cistercian monastery, founded about 1200, and was the headquarters of the notorious but influential Hell-Fire Club in the 18th century. Pop. (2001) 14,004; (2011) 14,325.