Glenfield is a suburb of Sydney, in the state of New South Wales, Australia. Glenfield is located 36 kilometres south-west of the Sydney central business district, in the local government areas of the City of Campbelltown and is part of the Macarthur region.

Glenfield railway station is a major interchange station for South-West Sydney. It is the junction for the East Hills railway line and the South West Rail Link and the Main Southern railway line. The station received a major upgrade as part of the South West Rail Link, including construction of an overhead concourse, multi-storey car park, new, fourth platform and conversion of a terminating platform to a through platform. The new railway line west to Leppington opened on 8 February 2015, meaning trains now serve Glenfield from the north, south, east and west.