| Honorific Prefix: | Lieutenant Colonel |
| The Lord Swansea | |
| Birth Date: | 22 April 1875 |
| Birth Place: | Eaton Square, London |
| Death Place: | Caer Beris, Builth Wells, Breconshire |
| Rank: | Lieutenant Colonel |
| Awards: | |
Odo Richard Vivian, 3rd Baron Swansea, MVO, DSO, TD (22 April 1875 – 16 November 1934), was a Welsh soldier from the Vivian family.
Vivian, the son of Colonel Henry Vivian, 1st Baron Swansea, and Averil Beaumont, was born in Eaton Square, London.[1] He studied at the University of Cambridge[2] and was awarded the Royal Victorian Order (Fourth Class) by King Edward, at Swansea, in July 1902.[3]
He served in World War I with the Royal Irish Rifles and the Cameron Highlanders.[4] He was Lieutenant Colonel of the 6th Battalion, Welch Regiment, Glamorgan Yeomanry, and was made a Companion of the Distinguished Service Order for gallantry during the war. He was awarded a Territorial Decoration in 1916. A diary by Vivian, kept during his service in the war, and including his account of the 1917 Battle of Ypres, is held by the National Library of Wales.[5]
He later served as a Justice of the Peace and was Deputy Lieutenant of Glamorgan.[1] In 1922 he gained the title of 3rd Baron Swansea on the death of his half brother, Ernest Vivian, 2nd Baron Swansea.[1]
His uncle Sir Arthur Vivian was a Liberal politician.
He died at his country seat, Caer Beris at Builth Wells in Breconshire, on 16 November 1934.[4]
He married Winifred Hamilton on 25 October 1906 and they had four children; Ursula Margaret (1910–1963), John Hamilton Hussey (who succeeded to the title as 4th Baron Swansea; 1925–2005), Rosemary Winifred (1927–1981), and Averil (born 1930).[1]