|Date of birth||16 August 1988|
|Height||1.88 m (6 ft 2 in)|
|* Senior club appearances and goals counted for the domestic league only.
He began his career in SBK Skiold, and joined FC Lyn Oslo as a youth player. He also attended the school Norwegian College of Elite Sport. He played one game in the Norwegian football cup 2005, but none in the league. He then joined Strømsgodset IF in 2006, where he got one Norwegian Premier League game in 2007. Ahead of the 2008 season he joined Svelvik IF.
- "Steffen Martinsen" (in Norwegian). Lyn Fotball.net. Retrieved 18 April 2009.
- Grennæs, Per Abraham (18 April 2008). "Hyggelig i bakgården". Drammens Tidende (in Norwegian). Retrieved 18 April 2009.
- "Neste generasjon SIF". Drammens Tidende (in Norwegian). 16 February 2006. Retrieved 18 April 2009.
- "Steffen Martinsen". 100% Fotball, Norwegian Premier League stats. Retrieved 18 April 2009.
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