Ingvar Ambjørnsen (born May 20, 1956 in Larvik) is a Norwegian writer. He is best known for his "Elling" tetralogy: Utsikt til paradiset (1993), Fugledansen (1995), Brødre i blodet (1996), and Elsk meg i morgen (1999).

Brødre i blodet (blood brothers) was turned into a successful movie, entitled Elling , which received an Oscar nomination in the Best Foreign Film catagory in 2001. The English translation of the novel is called Beyond the Great Indoors.

He now lives in Hamburg.