Commander Henry Alexander Stuart-Menteth DSC, usually shortened to Alex Stuart-Menteth (26 August 1912 – 14 May 2000) was a British naval officer famous for his service in the Royal Navy, particularly during World War II where he assisted in the sinking of two U-boats; and helped capture Enigma code fragments which enabled Bletchley Park to decipher the code. He commanded six ships during his career.