Karl Ivan Westman (August 5, 1889 – April 24, 1970), Swedish diplomat, 1928–1938 Sweden's Minister in Bern 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.
Westman had, as the highly intelligent man he was, done a fast career in Sweden's foreign ministry.
His analyses of the host countries, and the power play at the League of Nations, were considered outstanding—a judgement that holds also in retrospect.
The mission at the League of Nations was considered central to Sweden's foreign policy during the interbellum; and when appointed to Helsinki, that was at a moment when it was considered the most crucial of Sweden's embassies.
For a diplomat, he was however also extraordinarily outspoken, often with a significant amount of sarcasm and unveiled criticism.
Karl Ivan Westman was the brother of Karl Gustaf Westman, Sweden's Justice Minister during World War II.