A very few of Harris' works have been adapted for other forms. (See also: portrayals of Frank Harris).
- A Modern Idyll, a short story which is printed in the collection Montes the Matador, was made into a short play, The Minister's Call, by Arthur Symons. This play was Symons's first; Oscar Wilde attended a performance of it, where it was produced as part of a triple bill, on the 4th March, 1892. The play may have been included in Symon's Collected Works (9 vols, Secker, 1924) but as yet I have been unable to verify this.
- The film Cowboy (1958), directed by Delmer Daves, screenplay by Dalton Trumbo and Edward H. North, is based on My Reminiscences as a Cowboy.
- The Spectacle Maker (1934), directed and written by John Farrow, was based on the short story The Magic Glasses, which is printed in the collection Unpath'd Waters.
A borderline case
In its first published form, Volume 5 of My Life and Loves arguably counts as an adaptation, since it was written by Alexander Trocchi from notes left by Harris after he died.