Gunnar Edvard Rode Heiberg (18 November 1857 – 22 February 1929) was a Norwegian poet, playwright, journalist and theatre critic.

He was born in Christiania a son of judge Edvard Omsen Heiberg (1829–1884) and his wife Minna (Vilhelmine) Rode (8 June 1836 – 1917).

The book was highly critical towards Oscar II, stemming from a news story that the King, when processioning in Støren, had personally knocked the hat off a farmer's head.

At the 16 January 1905 première of Kjærlighedens Tragedie Heiberg held a speech against the union, stating that a peaceful continuation of the present conditions between Sweden and Norway was impossible.

Present at the event was the former (1900–1902) Liberal Party of Norway Minister of Defence Georg Stang, whom Heiberg greatly admired for his work on the construction of many of the defensive fortifications along the Norwegian–Swedish border.

[5] One of Heiberg's main points of contention with the Karlstad Treaty was the Norwegian acceptance to dismantle the border fortifications, writing in Dagbladet 13 September 1905 that "an honourable war is far less dank and sickening than a dishonourable peace".

In 1912 Heiberg attacked Christian Michelsen,[1] a republican who worked to dissolve the union but advocated monarchy,[8] in the play Jeg vil værge mit land.