Leave All Fair is a 1985 New Zealand made film starring John Gielgud as John Middleton Murry the husband of Katherine Mansfield.

He is presented as a sanctimonious exploiter of her memory, who ill-treated her during their association. Jane Birkin plays both Mansfield in flashbacks and the fictitious Marie Taylor who finds a letter from the dying Mansfield to Murry in his papers.

The theme was developed by New Zealand director Stanley Harper, but he was fired two weeks before shooting, and John Reid took over the project, introducing the "ghost" element and the two time frames. Shot in France at Moulin d'Ande and St Pierre du Vauvray with finance raised by Pacific Films, the film had to be finished before the 1984 cut-off date for New Zealand tax breaks.