Rupert Watson, 3rd Baron Manton

(Joseph) Rupert Eric Robert Watson, 3rd Baron Manton (22 January 1924 – 8 August 2003), DL, of Houghton Hall in the parish of Sancton, Yorkshire, was a British soldier, landowner and racehorse owner who served as Senior Steward of the Jockey Club (1982-5).

He was the only son and heir of Miles Watson, 2nd Baron Manton by his first wife Alethea Langdale, the younger of the two daughters and co-heireses of Colonel Philip Joseph Langdale, OBE, JP, DL, of Houghton Hall. In 1936 when Watson was 12 years of age, his parents were divorced and his father remarried two years later.

He was educated at Eton. He inherited the barony on the death of his father in 1968. He was given Houghton Hall by his aunt Countess FitzWilliam (1898-1995) (née Joyce Elizabeth Mary Langdale) who from 1956 was the wife of William Thomas George Wentworth-FitzWilliam, 10th Earl FitzWilliam (1904–1979). With her husband's home, Wentworth Woodhouse, near Rotherham, Yorkshire, being the largest private residence in England, and with his second seat of Milton Hall, Peterborough, being the largest house in Cambridgeshire, also at her disposal, she may have felt little need to retain Houghton for her own use.

In 1942 Watson joined the British Army and the next year was commissioned into the Life Guards. He saw service in Egypt, Germany, and Italy. He was promoted captain and retired in 1947. In 1951 he returned to the army and served in the 7th Queen's Own Hussars until 1956. He then served in the Leicestershire Yeomanry, in which he was appointed Adjutant.

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