James Williamson Manson (31 March 1908 – 30 August 1974) was a Scottish-born Australian politician.
He was born in Glasgow to drapery buyer Andrew Manson and Margaret Cranston Williamson Minto.
He served in the military during World War II, and on 12 September 1942 married Daphne Ruby Haines, with whom he had four children.
He moved to Victoria, where he was public relations officer for the Liberal Party from 1949 to 1955.
In 1955 he was elected to the Victorian Legislative Assembly for Hawthorn, transferring to Ringwood in 1958.