Carsten Walfrid Thunborg (2 June 1918, Tyssedal, Odda, Norway - 22 December 2000), was a Swedish politician. Thunborg was the son of Anders Walfrid Thunborg and Karen Bruvik. He worked as a sailor 1933–1936, then as construction worker between 1936 and 1951, and again from 1953 to 1957. Between 1951 and 1953 he worked as a journalist at Norrskensflamman in Luleå. He was an organizer of the Swedish Construction Workers Union. Between 1957 and 1968 he was a member of the board of Section 36 of the union.