Don't Drink the Water is a British sitcom television series produced by London Weekend Television for the ITV network. The series was created by Ronald Chesney and Ronald Wolfe (who wrote almost every episode) and is a spin-off from their long running sitcom On the Buses. The storyline follows Cyril Blake (Stephen Lewis) living in Spain with his sister Dorothy (Pat Coombs) after his retirement from the Luxton & District Traction Company. Thirteen episodes were broadcast over two series from 27 July 1974 to 6 December 1975.

Don't Drink the Water has been described by the Radio Times Guide to TV Comedy as being one of the worst British sitcoms ever produced.