Sir John Charles Watson, MBE KC (9 July 1883 – 8 February 1944) was an advocate and sheriff from Scotland. He served from 1929 to 1931 as Solicitor General for Scotland in Ramsay MacDonald's second Labour Government. A long-standing activist in the Scottish Liberal Party, his political ambitions were thwarted after his military service in World War I. Instead he built a successful legal practice, and grew closer to the Labour Party, leading to his appointment in 1929 as a law officer.