R.O.I., R.P., A.R.A., R.A. (8 March 1869, London - 11 April 1934, London) was an English portrait artist of the late romantic school who sometimes worked in the style of the Italian Renaissance. He studied at the RA Schools from 1889, exhibited at the Royal Academy from 1891. He won Royal Academy Schools Silver Medals in 1889 and 1891, and the Landseer Scholarship in 1892. He was elected R.O.I. in 1900, R.P. in 1904, A.R.A. in 1923, and a Member of the Royal Academy (R.A.) in 1932.
He married Hilda, a dancer and mime artist, and follower of the actor Edward Gordon Craig. They had a daughter, Mary Spencer Watson (1913 - 2006), who became a sculptor. In 1923 he bought Dunshay Manor in the hills of the Isle of Purbeck, after already have spent holidays in Swanage.
He died in London and a memorial exhibition was held at the Fine Art Society in the same year. There is a memorial to him in the north vestibule of St James's Church, Piccadilly, London.
Some of his works are held at Tate Britain, the Harris Art Gallery, Preston and collections in Bournemouth, Liverpool, Plymouth and the National Gallery of Canada. Born in London, Watson studied at the Royal Academy from 1889; he exhibited there from 1891 and also at the Paris salon. Retrospective exhibitions were held at the Galerie Heinemann, Munich in 1912, and at the Fine Art Society in 1914. His work A Lady in Black (1922) is owned by the Tate Collection.