Coordinates: 50°40′48″N 3°14′20″W / 50.680°N 3.239°W / 50.680; -3.239

Sidmouth ( /ˈsɪdməθ/) is a town situated on the English Channel coast in Devon, South West England, 15 miles (24 km) southeast of Exeter. It has a population of about 15,000, of whom 40% are over 65. It is a tourist resort and a gateway to the Jurassic Coast World Heritage Site. A large part of it has been designated a conservation area.

Sidmouth appeared in the Domesday Book as Sedemuda. Like many such settlements, it was originally a fishing village. Although attempts have been made to construct a harbour, none has succeeded. A lack of shelter in the bay prevented growth as a port.

Sidmouth remained a village until the fashion for coastal resorts grew in the Georgian and Victorian periods of the 18th and 19th centuries. The numerous fine Georgian and Regency villas and mansions are now mostly hotels.

In 1819, George III's son Edward, Duke of Kent, his wife, and baby daughter (the future Queen Victoria) came to stay at Woolbrook Glen for a few weeks. In less than a month he had died from an illness. The house later became the Royal Glen Hotel; a plaque on an exterior wall records the visit.