Alois Delug (25 May 1859 – 17 September 1930) was an Austrian painter and a professor at the Academy of Fine Arts, Vienna.

In 1885, he began a three-year period of travelling, visiting England, Italy, France, Germany and Holland, then settled in Munich in 1888 and accepted orders for historical and religious paintings.

According to Josef Greiner, Delug denied Adolf Hitler a place at the academy because of inadequate drawing ability.

[4] However, according to Brigitte Hamann, Delug was perennially at odds with the rest of the faculty, who did not share his Modernist and Secessionist tastes, and in 1907–08, he was not in Vienna after another falling-out.

His painting The Markl Family (1907) was shown as part of Facing the Modern: The Portrait in Vienna 1900, an exhibition at the National Gallery, London, from October 2013 to January 2014.