Yuriy Aleksandrovich Rastvorov (Russian: Юрий Александрович Растворов; 11 July 1921 – 19 January 2004) known after his defection under the alias of Martin F. Simons, was a Russian former KGB agent and later CIA agent who defected from the Soviet Union to the west while in Japan in 1954. He was sentenced to death in absentia by the Supreme Court of the Soviet Union.