Johan Widing Heiberg Landmark (12 April 1802 – 16 November 1878) was a Norwegian jurist and politician.
He was born in Gloppen to Nils Landmark and Barbra Henriette Rantzau Heiberg.
[1] His uncle Andreas Landmark was notable as a politician, and his grandfather had migrated to Norway from Sweden.
In 1833 he was hired as an attorney in Fjaler,[2] where his father was seated as the district stipendiary magistrate (sorenskriver) of Sunnfjord.
Johan was given the property Fagervik, previously a part of his father's farm Tysse.