The Lucas Watermills Archaeological Sites are two heritage-listed archaeological sites in Sydney, New South Wales, Australia. The sites comprise the remnants of two convict-era watermills, the Brisbane Mill on the Williams Creek at Creekwood Reserve, Voyager Point and the Woronora Mill on the Woronora River at Barden Ridge. The original watermills were designed by John Lucas and built from 1822 to 1825 by assigned convict labour. The sites were added to the New South Wales State Heritage Register on 30 August 2017.