Weymouth ( WAY-məth) is a seaside town in Dorset, on the English Channel coast of England. Situated on a sheltered bay at the mouth of the River Wey, 11 kilometres (7 mi) south of the county town of Dorchester, Weymouth had a population of 53,427 in 2021. It is the third largest settlement in Dorset after Bournemouth and Poole. The greater Weymouth urban area has a population of 72,802. The history of the town stretches back to the 12th century and includes roles in the spread of the Black Death, the settlement of the Americas and the development of Georgian architecture. It was a major departure point for the Normandy Landings during World War II. Prior to local government reorganisation in April 2019, Weymouth formed a borough with the neighbouring Isle of Portland. Since then the area has been governed by Dorset Council. Weymouth, Portland and the Purbeck district are in the South Dorset parliamentary constituency.
A seaside resort, Weymouth and its economy depend on tourism. Visitors are attracted by its harbour and position, approximately halfway along the Jurassic Coast, a World Heritage Site, important for its geology and landforms. Once a port for cross-channel ferries, Weymouth Harbour is now home to a commercial fishing fleet, pleasure boats and private yachts, while nearby Portland Harbour is the location of the Weymouth and Portland National Sailing Academy, where the sailing events of the 2012 Olympic Games and Paralympic Games were held.