Mollymook is located on the South Coast of New South Wales, Australia approximately three hours' drive south of Sydney within the City of Shoalhaven local government area. At the 2016 census, Mollymook had a population of 1,083 while the adjacent locality of Mollymook Beach was home to a further 2,447 people. Geographically, Mollymook is considered part of the Milton-Ulladulla district, a coastal corridor of urban development stretching from Burrill Lake, south of Ulladulla to Mollymook's northern neighbour, Narrawallee and the historic town of Milton a few kilometres inland.
The area collectively referred to as Mollymook is formed by two distinct localities; Mollymook Beach - a mostly residential area incorporating Bannister Headland adjoining Narrawallee, and Mollymook - containing the Mollymook golf and surf lifesaving clubs, motels and serviced apartments. The name "Mollymook" is believed to be a corruption of mollymawk, the name given by sailors to small species of albatross.