Jean Hjalmar Dahl Heiberg (19 December 1884 – 27 May 1976) was a Norwegian painter, sculptor, designer and art professor. Heiberg was born in Kristiania to Hjalmar Heiberg and Jeanette Sofie Augusta Dahl. Both his father and grandfather were professors of medicine. His mother died of puerperal fever one week after his birth.
Heiberg's first wife (from 1913 to 1920) was the sculptor Sigri Welhaven. In 1922 he married the painter Agnes Mannheimer, who died in 1934. In 1954 he married Anna Clev.

Heiberg finished his secondary education at Hamar in 1903. He studied at the Royal Drawing School (Den Kongelige Tegneskole) in Kristiania from 1903 to 1904, and in Munich from 1904 to 1905. He studied at the Académie Colarossi in Paris in 19...