Crosby is a coastal town in the Metropolitan Borough of Sefton, Merseyside, England. Historically in Lancashire, it is north of Bootle, south of Southport and Formby, and west of Netherton. It abuts the areas of Blundellsands to the north and Waterloo to the south. It is approximately 6 miles (9.6 km) north of Liverpool City Centre.

The Metropolitan Borough of Sefton is a metropolitan borough of Merseyside, England. It was formed on 1 April 1974, by the amalgamation of the county boroughs of Bootle and Southport, the municipal borough of Crosby, the urban districts of Formby and Litherland, and part of West Lancashire Rural District. It consists of a coastal strip of land on the Irish Sea which extends from Southport in the north to Bootle in the south, and an inland part to Maghull in the south-east, bounded by the city of Liverpool to the south, the Metropolitan Borough of Knowsley to the south-east, and West Lancashire to the east.