The Faithful Heart is a 1921 play by the Irish writer Monckton Hoffe.
Act one is set in "the private office of Colonel Ango in a hotel converted by the war department".
Act two is set in "Colonel Ango's flat in Mount Street, London".
In 1922 it was made into a silent film The Faithful Heart starring Lillian Hall-Davis.
The play was adapted for television in 1950 by the BBC for an episode of the Sunday Night Theatre featuring Richard Littledale and Ballard Berkeley.