Colin Charles "Col" Firmin (11 April 1940 – 3 March 2013) was a former Australian politician. Firmin served as an Alderman for the City of Darwin from 1976 to 1983 before his preselection by the ruling Country Liberal Party (CLP) for the Electoral division of Ludmilla in the Northern Territory Legislative Assembly and his subsequent election at the 1983 Northern Territory election. Firmin died in Buddina, Queensland on 3 March 2013, aged 72, from undisclosed causes.