Jens Landmark (17 December 1811 – 9 July 1880) was a Norwegian military officer and politician.
He reached the rank of lieutenant colonel, was the director of Kongsberg Weapons Factory from 1854 to 1880, invented the Landmark conversion and served both as mayor as well as three periods in the Norwegian Parliament.
He was born in Ulfsten[1] to Andreas Landmark and Jacobine Caroline Wind.
He married Richarda Mathea Petrie Bruenech (1813–1854), who hailed from Kongsberg.
[4] In 1862 Landmark was elected to the Norwegian Parliament, representing the constituency of Kongsberg.