Thomas Roy Southworth (born April 12, 1944 in Washington, D.C.) is an American retired slalom canoeist who competed in the 1960s and 1970s.

He won a bronze medal in the mixed C-2 team event at the 1969 ICF Canoe Slalom World Championships in Bourg St.-Maurice.

Southworth also finished 12th in the C-2 event at the 1972 Summer Olympics in Munich.

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