Karl Stirner (4 November 1882, Rosenberg – 21 June 1943, Schwäbisch Hall) was a German painter, watercolorist, illustrator and writer.
After completing his primary education, in 1896, he was apprenticed to a decorative painter and carpenter named Severin Weber, in Ellwangen.
After his return in 1906, thanks to a scholarship, he briefly attended the Kunstgewerbeschule in Stuttgart, where he studied with the graphic artist, Hans von Kolb [de].
He also met the Expressionist painter, Ernst Ludwig Kirchner, who had a significant influence on his future artistic development.
He made a second trip to Algeria in 1929, and accompanied his friend, the church painter Alois Schenk [de], on a tour of Palestine.