Knud Geelmuyden Fleischer Maartmann (1821 – 1888) was a Norwegian politician.

He was elected to the Parliament of Norway in 1865, representing the urban constituency of Flekkefjord

Flekkefjord

is a town and municipality in the county of Vest-Agder, Norway.The town of Flekkefjord was established as a municipality on 1 January 1838 . The rural municipalities of Bakke, Gyland, Hidra, and Nes were merged with Flekkefjord on 1 January 1965.Flekkefjord is the westernmost town of the...

. He worked as a merchant in the city. He was re-elected in 1868, and thus served two terms.

Together with Kirstine Solberg he had the daughter Kaja Maartmann (1851–1933), who married Ellef Ringnes

Ellef Ringnes

Ellef Ringnes was a Norwegian brewer and patron.He was born at the Ringnes farm in Krødsherad, Buskerud to farmer Anders Knudsen Ringnes and his wife Maren Amundsdatter . His father left the farm in 1855, and Ellef was employed as travelling salesman for Christiania Bryggeri at the age of 18...

, brother of Amund Ringnes

Amund Ringnes (brewery owner, 1840)

Amund Ringnes was a Norwegian businessman, brewery owner and patron.He was born in Krødsherad, Buskerud to farmer Anders Knudsen Ringnes and his wife Maren Amundsdatter . He grew up at the farm Ringnes, and commenced working at Akers Mekaniske Verksted in 1860. He left Akers Mek...

 and founder of Ringnes Bryggeri. Maartmann was the grandfather of Knud Maartmann Ringnes

Knud Ringnes

Knud Maartmann Ringnes was a Norwegian businessperson.He was born in Kristiania as the oldest son of Ellef Ringnes and Kaja, née Maartmann...

.