- Stepgrandfather of composer Kim Fowley.
- Father-in-law of Shelby Payne.
- Father of Rudolf Friml Jr., who is sometimes confused with his father. Friml Jr. is a bandleader who sometimes made unbilled appearances in films. One of his few screen credits was as a pianist in an anti-marijuana B-movie. Friml Sr., the operetta composer, never made any film appearances, though he wrote music for quite a few films. Several of his stage operettas were filmed, the most famous being the wildly successful 1936 film version of Rose-Marie (1936), with Jeanette MacDonald and Nelson Eddy.
- His operetta "The Vagabond King" is the first of his famed stage works to be given a full-length recording (both music and dialogue). The recording, sung by the Ohio Light Opera, was released in early 2005.
- Inducted into the Songwriters Hall of Fame in 1971.
- Father of Rudolf Friml Jr. and William Friml.
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