Deadwater(s) or Dead water may refer to:
Places Deadwater, Hampshire, village in England Deadwater, Northumberland, village in England Deadwater railway station, a closed railway station Deadwaters, South Lanarkshire, a village in Scotland; See List of places in South Lanarkshire Deadwater Ait, island in the River Thames near Windsor, Berkshire, England
Other uses Deadwater (film), horror film Deadwater (topography), part of an estuary through which there is little to no water flow Dead water, nautical term when a layer of fresh water rests on top of denser salt water, without mixing dead water caused by low oxygen levels in aquatic environments