Lithgow is a city in the Central Tablelands of New South Wales, Australia and is the administrative centre of the City of Lithgow local government area. It is located in a mountain valley named Lithgow's Valley by John Oxley in honour of William Lithgow, the first Auditor-General of New South Wales.
Lithgow is on the Great Western Highway, about 150 km (93 mi) or two hours drive west of Sydney, or via the old mountain route, Bells Line of Road, from Windsor. Geographically, it is situated on the far western side of the Sydney basin. At June 2015 Lithgow had an estimated urban population of 13,035.
Lithgow is surrounded by a varied landscape which includes national parks, one of which, the Blue Mountains National Park, is a World Heritage Area. The Wollemi National Park is home to the Jurassic-age tree the Wollemi Pine, which was found growing in a remote canyon in the park.