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Lismore is a city in northeastern New South Wales, Australia and the main population centre in the City of Lismore local government area; it is also a regional centre in the Northern Rivers region of the State. It is situated on a low flood plain on the banks of the Wilsons River near the latter's junction with Leycester Creek, both tributaries of the Richmond River which enters the Pacific Ocean at Ballina, 30 km (19 mi) to the east. The original settlement initially developed as a grazing property, then became a timber and agricultural based town and inland port based around substantial river traffic, which declined and then ceased around the mid-twentieth century. The city is also located on the Bruxner Highway which crosses the Wilsons River at Lismore, and was formerly a stop on the Casino-Murwillumbah railway line. It is the home of one of the three campuses of Southern Cross University.

With its low-lying position adjacent to the Wilsons River which can rise rapidly following periods of high rainfall in its catchment, the centre of Lismore is susceptible to flooding, although it is partly protected by a system of levees and flood gates; noteworthy recent floods occurred in 1974 and again in 2017 in the aftermath of Cyclone Debbie. A budget was announced for additional flood mitigation works in November 2018.

As of June 2018, the urban population of Lismore was 28,720.