Duke Charles Frederick of Holstein-Gottorp (30 April 1700 – 18 June 1739) was the son of Frederick IV of Holstein-Gottorp and his consort, Hedvig Sophia, daughter of King Charles XI of Sweden. He became reigning duke in infancy, upon his father's death in 1702, and all his life was a legitimate claimant to the throne of Sweden, as pro forma heir to Charles XII, who was his maternal uncle.