The Kremlin Letter is a 1970 American spy thriller film in Panavision directed by John Huston and starring Richard Boone, Orson Welles, Max von Sydow, Bibi Andersson, Patrick O'Neal, and George Sanders. It was released in February 1970 by 20th Century-Fox.

Richard Allen Boone was an American actor who starred in over 50 films and was notable for his roles in Westerns, including his starring role in the television series Have Gun – Will Travel.