Lord Rhidian Crichton-Stuart (4 June 1917 – 25 June 1969) was a son of The 4th Marquess of Bute and Augusta, Marchioness of Bute. Lord Rhidian Crichton-Stuart was educated at Ampleforth College and at Magdalene College, Cambridge. He gained the rank of captain in the service of the Royal Artillery (RARO). He was admitted to Royal Company of Archers in 1948. He was a British member of the International Legislative Assembly of the Tangier International Zone from 1953 to 1956. He was a Knight of Obedience, of the Sovereign Military Order of Malta. He died on 25 June 1969, aged 52.