Colyton is a suburb of Sydney, in the state of New South Wales, Australia 43 kilometres west of the Sydney central business district, in the local government area of the City of Penrith. It is part of the Greater Western Sydney region. Colyton, along with Erskine Park, are the easternmost suburbs of the City of Penrith. Its boundaries are Ropes Creek, the Great Western Highway, Marsden Road and the M4 Western Motorway.