Clarence Copithorne (November 12, 1920 – June 4, 1979) was a provincial level politician from Alberta, Canada. He served as a member of the Legislative Assembly of Alberta from 1967 to 1975 sitting as an Independent and later with the Progressive Conservative caucus in both opposition and government. During his time in office he served as a cabinet minister in the government of Peter Lougheed from 1971 to 1975.