Stig Erik Constans Wennerström (August 22, 1906 – March 22, 2006) was a colonel in the Swedish Air Force who was convicted of treason in 1964. During the 1950s, he leaked the Swedish air defence plans and the entire Saab Draken fighter jet project to the Soviet Union. He also worked as a military attaché in Washington, DC, where he was very useful to the Russian military intelligence agency, the GRU. He also served in the same role in Moscow.