Aintree is a village and civil parish in the Metropolitan Borough of Sefton, Merseyside, England. Historically in Lancashire, it lies between Walton and Maghull on the A59 road, 5+1⁄2 miles northeast of Liverpool city centre, in North West England.

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.