Harold Francis Riley DL (born 21 December 1934), is an English artist. He sold his first painting to the Salford Museum and Art Gallery when he was 11.

Riley attended Salford Grammar School. In 1951 he won a scholarship to the Slade School of Fine Art, University College, London. After a one-year postgraduate course at the Slade he won a travel scholarship to Italy, followed by a British Council Scholarship to study in Spain, and went on to study in Florence and Spain before returning to Salford, where he has lived ever since. He completed his National Service as an officer in 1957. In 1960 Riley returned to Salford, where he still lives and works. He believed his main work was to document the city and his life-cycle in Salford in paintings, drawings and photographs. His deep affection for his home town cemented a friendship with L.S. Lowry, which began when Riley was a student. Riley has been awarded honorary doctorates by the universities of Salford, Manchester, London and Florence. Riley's commissioned painted portraits include Prince Philip, Duke of Edinburgh, Prince Alexander of Yugoslavia, Princess Alice, Duchess of Gloucester, Pope John XIII, Pope Paul VI, Pope John Paul II, American Ambassador Elliot Richardson, United States presidents John F. Kennedy and Gerald Ford, and Nelson Mandela.