Bryan Walter Guinness, 2nd Baron Moyne (October 27, 1905 - July 6, 1992), was an heir to the Guinness family brewing fortune, lawyer, poet and novelist. He married Diana Mitford, but later divorced her.

He was born to Walter Edward Guinness (created 1st Baron Moyne in 1934), son of the 1st Earl of Iveagh, and Lady Evelyn Stuart Erskine, daughter of the 14th Earl of Buchan. He attended Heatherdown, Eton College, and Christ Church, Oxford, and was called to the Bar in 1931.

As an heir to the Guinness brewing fortune and a handsome, charming young man, Bryan was an eligible bachelor. In 1929, he married the Hon. Diana Mitford, one of the infamous Mitford sisters, and had two sons with her. The couple became leaders of the London artistic and social scene and were dedicatees of Evelyn Waugh's first novel Vile Bodies. However, they divorced in 1933, after Diana deserted him for British fascist leader Sir Oswald Mosley. Guinness remarried happily in 1936 to Elisabeth Nelson, with whom he would have nine children.

In 1944, while serving his country as a liaison officer, Guinness succeeded to the barony when his father, posted abroad as a Minister Resident in the Middle East, was assassinated in Israel. After the war, Lord Moyne served on the board of the Guinness corporation, as well as various trusts and artistic committees in Ireland. He wrote a number of critically applauded novels, memoirs, books of poetry, and plays.

Lord Moyne died in 1992 at Biddesden, his home in Hampshire, and was succeeded by his eldest son Jonathan.

His works:

• Plays: The Fragrant Concubine, A Tragedy (1938); A Riverside Charade (1954)
• Childrens books: The Story of Johnny and Jemima (1936); The Children of the Desert (1947); The Animal’s Breakfast (1950)
• Poetry: Twenty-three Poems (1931); Reflexions (1947); Collected Poems (1956); Selected Poems (1964); The Clock (1973).
• Novels: Singing Out of Tune (1933); Landscape with Figures (1934); A Week by the Sea (1936); Lady Crushwell’s Companion (1938); A Fugue of Cinderellas (1956); Leo and Rosabelle (1961); The Giant’s Eye (1964); The Engagement (1969); Hellenic Flirtation (1978)
• Memoirs: Potpourri (1982).