Oskar Artur Alexander (February 20, 1876 – April 16, 1953) was a Croatian academic painter and professor.

Alexander had stepbrothers Viktor and Erich, brothers, Artur and Robert Milan, and two sisters, Gizela and Olga.

He also studied at the Académie Julian in Paris, under Eugène Carrière and James Abbott McNeill Whistler.

Among many, Alexander portrayed Engelbert Dollfuss, Vladko Maček and Josip Broz Tito while he visited his sister in Samobor, 1948.

[6] Alexander died on April 16, 1953, in Samobor heartbroken by the Holocaust, which he barely survived, and events during the World War II.