Lytham St Annes (/ˈlɪðəm sənt ˈænz/) is a seaside town in the Borough of Fylde, Lancashire, England. It is located on the Fylde coast, directly south of Blackpool, on the Ribble Estuary. The population of the built-up area at the 2021 census was 42,695.
The town is made up of four areas: Lytham, Ansdell, Fairhaven and St Annes-on-the-Sea. Lytham is the older settlement and the parish of Lytham used to cover the whole area. St Annes was founded as a new seaside resort in the 1870s on open land at the western end of the parish. From 1878, the two towns were administered separately; Fairhaven and Ansdell were part of Lytham. They were reunited in 1922 under the compound name Lytham St Annes. A civil parish called Saint Anne's on the Sea was created in 2005 to cover the western part of the built-up area.