A Twist of Sand is a 1968 British adventure film directed by Don Chaffey and starring Richard Johnson, Jeremy Kemp, Honor Blackman and Peter Vaughan.

When a former colleague appears and tells a wild story about smuggling diamonds out of south-west Africa, he sees his chance to make a lot of money.

In recurring flashbacks, the captain relives his wartime experiences as the commander of a Royal Navy submarine, sent to South African waters to destroy an experimental U-Boat.

Geoffrey Jenkins initially sold the rights for his 1959 novel to filmmaker Nunnally Johnson at 20th Century Fox.

Johnson intended to write the script himself and have Robert Mitchum and Deborah Kerr cast in the starring roles.