Cucumber Castle is a British comedy film made for television directed by Hugh Gladwish and starring the Bee Gees, Eleanor Bron and Frankie Howerd.

The film intersperses comedy sketches with Bee Gees songs plus performances by Lulu and Blind Faith with several cameo appearances.

By the time filming began in 1969, the Bee Gees were down to a trio consisting of Barry and Maurice Gibb and the drummer Colin Petersen.

His scenes from the film were cut and he is not credited on the accompanying album, though he does play on some songs.

The tape was once cited by Video Review magazine as the rarest commercial release ever, and copies have fetched three figures on the collector's market.