Lithgow is a town 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.

The Central Tablelands in New South Wales is a geographic area that lies between the Sydney Metropolitan Area and the Central Western Slopes and Plains. The Great Dividing Range passes in a north–south direction through the Central Tablelands and includes the Blue Mountains. The region shares borders with the Hunter, Central West Slopes and Plains, South West Slopes, Southern Tablelands, North Western Slopes and Plains, the Sydney Metropolitan Area and the Illawarra.