Ivar Aavatsmark (11 December 1864 – 1 July 1947) was a Norwegian officer and politician for the Liberal Party. He finished his military career in 1928, as Major General, head of the 2nd Division and Commander of Akershus Fortress. As a politician he was a five-term MP between 1907 and 1921, and served as Minister of Defence from 1919 to 1920 and 1921 to 1923.