Robert Hugh Carlin (February 10, 1901 – October 22, 1991) was a Canadian labour union organizer and politician, who represented the electoral district of Sudbury in the Legislative Assembly of Ontario from 1943 to 1948. He was a member of the Co-operative Commonwealth Federation (Ontario Section) (CCF). He subsequently moved to Sudbury, where he became president of Mine Mill Local 598, and won election to the Legislative Assembly in the 1943 election and was re-elected in the 1945 election. Carlin died in Sudbury at the age of 90.