|Date of birth||28 August 1981|
|Place of birth||Kristiansand, Norway|
|Height||1.85 m (6 ft 1 in)|
|Playing position||left back|
|2006–2007||→ 1. FC Köln (loan)||12||(0)|
|* Senior club appearances and goals counted for the domestic league only.
During the summer of 2005, he made his debut on the Norwegian national team.
In the end of 2006, Johnsen signed a loan contract with 1. FC Köln in the German 2. Bundesliga that expired at the end of the German 2. Bundesliga season in May. He made his debut for the German club pn 26 January 2007 victory against SV Wacker Burghausen. On 14 June 2007, Lillestrøm SK officially announced the signing of Johnsen on a five-year deal.
Since he signed for Lillestrøm he has been constantly injured. On 25 August 2010, it was reported that he needed a knee surgery and would be out for at least a year, up to a year and a half.
|2006–07||1. FC Köln||2. Fußball-Bundesliga||12||0||0||0||12||0|
Johnsen has previously studied religion at the Agder University College, planning to teach history and/or religion at a college or University. Like the rest of his family, he is involved in the activities of the Norwegian Free Church. Like his brother, he has made a mark in the national press for publicly expressing his religious beliefs.
- "Marius Johnsen" (in German). fussballdaten.de. Retrieved 21 July 2012.
- Marius Johnsen at National-Football-Teams.com