James Sillars (born 4 October 1937) is a Scottish politician and campaigner for Scottish independence. Sillars served as a Labour Party MP for South Ayrshire from 1970 to 1976. He founded and led the pro-Scottish Home Rule Scottish Labour Party in 1976, continuing as MP for South Ayrshire until he lost the seat in 1979. Sillars joined the Scottish National Party in 1980 and later served as MP for Glasgow Govan after winning a by-election in 1988, and was Depute Leader of the Scottish National Party. He was married to Margo MacDonald until her death in 2014.