Ivar Teodor Vennerström (1881[1] - 1945) was a Swedish Social Democratic politician, member of the Riksdag 1915 - 1936.
Vennerström joined the left opposition of the Swedish Social Democratic Party in the split of 1917, and initially supported the Bolshevik revolution in Russia.
But Vennerström opposed the Twenty-one Conditions of the Communist International and left the Left Party in 1921 as it became the Communist Party of Sweden.
Vennerström rejoined the Social Democratic Party in 1924[2] and he was made Minister for Defence 1932 - 1936.
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