Sefton is a suburb in Western Sydney, Australia. It is located 23 kilometres west of the Sydney central business district, in New South Wales, Australia. It shares the 2162 postcode with the neighbouring suburb of Chester Hill.

Sefton railway station is located on the Main Southern line, serving the Sydney suburb of Sefton. The station is heritage-listed in the state heritage register for New South Wales. It is served by Sydney Trains T3 Bankstown line services.