Crystal Voyager is a 1973 Australian surf film directed by David Elfick. It was filmed, written and narrated by surfer, photographer and filmmaker George Greenough who had previously made the 1970 surfing film The Innermost Limits of Pure Fun.
The film is structured as a loose biography of Greenough and was shot largely in California. It documents Greenough’s search for uncrowded waves, which led to the construction of his 37-foot ocean-going yacht. It also feature Greenough's surfing friends, Californian Richie West and Australian world champion Nat Young.
Crystal Voyager premiered at the Sydney Opera House on 5 December 1973 and had a successful three-week run there before opening in other states. The theatrical 35mm version of the film is different from the original 16mm release and was re-edited by Elfick and Greenough. It became one of Australia's most successful surf films, grossing more than A$100,000 on its initial Australian release, before being picked up by British Hemdale Corporation. Crystal Voyager gained substantial press on its release, mostly due to its strong reception at the Cannes Film Festival.