Izidor Cankar (22 April 1886 – 22 September 1958) was a Slovenian author, art historian, diplomat, journalist, translator, and liberal conservative politician. He was one of the most important Slovenian art historians of the first part of the 20th century, and one of the most influential cultural managers in interwar Slovenia.
Izidor Cankar was born in Šid, in what was then the Austro-Hungarian Kingdom of Croatia-Slavonia (now part of the Serbian province of Vojvodina). His father, Andrej Cankar, was a Slovene tradesman from Inner Carniola, while his mother, Marija Huber, was from a mixed Danube Swabian-Croat family. Izidor was a cousin of the famous writer Ivan Cankar. At the age of seven, his father went bankrupt. Young Izidor was taken into fostering by his aunt Karolina Hofberg. Cankar grew up in a multicultural environment, and spoke Croatian, German and Hungarian since a young age. He attended Croatian-language schools, and throughout his life, he claimed his Croatian was better than his Slovene. In 1897, his cousins Ivan and Karlo Cankar convinced him to move to Ljubljana, where he attended the Classical Lyceum. In 1905, after finishing high school, he decided to become a priest and enrolled in the Roman Catholic seminary in Ljubljana. There, he met the theologian Andrej Kalan, who had a decisive influence on Cankar's future intellectual development.