A Glass of Water (German: Ein Glas Wasser) is a 1923 German silent historical drama film directed by Ludwig Berger and starring Mady Christians, Lucie Höflich and Hans Brausewetter. It premiered at the UFA-Palast am Zoo on 1 February 1923. It was based on a play of the same title by Eugène Scribe, set in England during the reign of Queen Anne. The film was very well received both commercially and critically on its release. It is considered one of the milestones of Weimar cinema.

The film's sets were designed by the art director Rudolf Bamberger. It was made at the Babelsberg Studios in Berlin with location shooting in Bayreuth.