Ronald Sinclair (21 January 1924 – 22 November 1992), born Richard Arthur Hould and sometimes credited as Ra Hould or Ron Sinclair, was a child actor from New Zealand, turned film editor.
Sinclair was a juvenile player turned film editor who retained his celebrity in his native New Zealand long after the end of his Hollywood acting career. Sinclair's feature credits include William Wellman's The Light That Failed, Tower of London, Alexander Korda's That Hamilton Woman and Raoul Walsh's Desperate Journey. He also appeared in a series of children's adventure films featuring the Five Little Peppers. Sinclair also starred in the 1938 adaptation of Charles Dickens' A Christmas Carol, starring Reginald Owen. He played young Scrooge.
He served as a soldier during World War II. After that, he resumed work in 1955, and began a long, fruitful collaboration with producer-director Roger Corman, which led to a busy career in low-budget independent filmmaking. Sinclair edited Corman's directorial debut, Swamp Women, and went on to work on at least a dozen of Corman's other films including Day the World Ended, The Intruder, Thunder Alley, The Raven and The Trip. He also edited a number of films by another low-rent auteur with big ideas, Bert I. Gordon: The Amazing Colossal Man, Invasion of the Saucer Men, War of the Colossal Beast, Attack of the Puppet People, and The Spider.