Lyme Regis is a coastal town in West Dorset, England, situated 25 miles west of Dorchester and east of Exeter. The town lies in Lyme Bay, on the English Channel coast at the Dorset–Devon border. It is nicknamed "The Pearl of Dorset." The town is noted for the fossils found in the cliffs and beaches, which are part of the Heritage Coast—known commercially as the Jurassic Coast—a World Heritage Site.
The harbour wall, known as "The Cobb", features in Jane Austen's novel Persuasion, and in The French Lieutenant's Woman, a novel by British writer John Fowles, as well as the 1981 film of the same name, which was partly filmed in Lyme Regis.
In the 2011 Census the town's parish had a population of 3,671.