Otto Nagel (27 September 1894 – 12 July 1967) was a German painter, graphic designer and long-time head of the Berlin Academy of Arts who was one of the most prolific artists of East Germany.

After completing his basic schooling, he briefly entered into an apprenticeship with a stained glass painter, but soon broke this off.

Throughout the 1920s he was very active in the Berlin art scene, becoming acquainted with Käthe Kollwitz, El Lissitzky, and many other notables.

In 1924, Nagel joined the Red Group in Berlin and accompanied an exhibition of young artists to the Soviet Union.

After the end of the Second World War, Nagel lived and worked in Bergholz-Rehbrücke in Potsdam, Brandenburg, later part of East Germany.