The Prospect Reservoir is a heritage-listed 50,200-megalitre potable water supply and storage reservoir created by the Prospect Dam, across the Prospect Creek located in the Western Sydney suburb of Prospect, in New South Wales, Australia. The eastern bounds of the reservoir are a recreational area and the western periphery are within the bounds of Western Sydney Parklands. It was added to the New South Wales State Heritage Register on 18 November 1999.

Prospect Creek is an urban watercourse of the Georges River catchment that is located in the western region of Sydney, in New South Wales, Australia. As Prospect Reservoir forms a part of the Sydney metropolitan water supply, the flow of the creek is regulated in accordance with the operational requirements of Sydney Water.