Karl Ivan Westman (August 5, 1889 – April 24, 1970) was a Swedish diplomat who served as Sweden's Ambassador to Switzerland in Bern between 1928 and 1938 and at the League of Nations, in connection with the Continuation War Sweden's ambassador to Helsinki March 1941 – October 1942, and after World War II Sweden's ambassador to Paris 1947–1956. Karl Ivan Westman was the brother of Karl Gustaf Westman, Sweden's Justice Minister during World War II.