Karl von Blaas (1815–1894) was an Austrian painter born in Nauders, Tyrol, who later worked in Vienna. He served as a professor at the Vienna Academy of Fine Arts from 1851 and at the Venice Academy of Fine Arts from 1855. Blaas primarily engaged with historical and genre painting, a style often associated with the late Biedermeier period and the Nazarene movement.
Blaas executed portraits and religious compositions, working both on canvas and in fresco. His oeuvre includes historical narratives and scenes of everyday life, reflecting the academic approach to art prevalent in his era. A notable work is "Head of a boy" (circa 1880).
Karl von Blaas established a painting dynasty; his sons, Julius and Eugen von Blaas, also became painters, as did his grandsons Giulio and Carl Theodor von Blaas. He taught Hungarian painter Sándor Liezen-Mayer at the Vienna Academy.
