Liddell is a locality in the Singleton Council of New South Wales, Australia.

[1] Liddell Post Office opened on 16 January 1890 and closed on 30 April 1931.

[3] The area is now the subject of coal mining operations by Liddell Coal.

[4] The Liddell Power Station is nearby, although it lies within the boundary of Muswellbrook.

Liddell has a number of heritage-listed sites, including: