Vingulmark was the name of a Viking Age petty kingdom around Oslofjorden. It seems that it once extended to the county of Østfold in addition to the areas of the current municipalities Oslo, Bærum, Asker, Røyken, Hurum, Lier and Eiker in south-eastern Norway.

Snorri Sturluson relates in the Heimskringla that it was conquered from the Swedish king Erik Emundsson by king Harald Fairhair when he created Norway.

Some know kings of Vingulmark are:

• Gudrød the Hunter, half of Vingulmark
• Alfgeir (Old Norse: Álfgeir)
• Gandalf Alfgeirsson
• Halfdan the Black
• Olaf Haraldsson
• Tryggve Olavsson
• Harald Gudrødsson Grenske , 976-987
• Svein Alfivuson , 1030-1035

During the middle ages, Vingulmark was an administrative unit limited to Oslo, Bærum and Asker.

See also: Viken