|Date of birth||24 August 1976|
|Place of birth||Dortmund, West Germany|
|Height||1.84 m (6 ft 0 in)|
|Rot Weiss Ahlen (Head coach)|
|1995–1998||Borussia Dortmund II|
|1999–2002||Borussia Dortmund II||119||(9)|
|2007–2009||Wuppertaler SV II|
|2008–2009||Wuppertaler SV II (player-assistant)|
|2009–2010||Westfalia Rhynern (player-assistant)|
|2010–2011||SV Hohenlimburg (player-coach)|
|2020||Rot Weiss Ahlen|
|* Senior club appearances and goals counted for the domestic league only|
Mehnert began his career with his hometown club, Borussia Dortmund, and progressed through the reserve team, being promoted to the first-team squad of the then-European champions in 1997. He made his debut in the second leg of the UEFA Super Cup against Barcelona, replacing Steffen Freund as a 20th-minute substitute, and made three appearances in the Bundesliga, and one in the Champions League, against Sparta Prague.
Mehnert left Dortmund at the end of the 1997–98 season, joining ambitious Regionalliga side LR Ahlen, but returned six months later for another couple of seasons in Dortmund's reserve team. In 2002, he signed for Wuppertaler SV, where he spent four and a half seasons, leaving in January 2007 to join Preußen Münster. Six months later he returned to Wuppertal to play for the reserve team, before joining amateur side Westfalia Rhynern. In 2010, he was appointed as player-manager of SV Hohenlimburg, before returning to manage Rhynern a year later, having retired. He also works for VfL Osnabrück, in the capacity of sports marketing and video analysis.
- "Mehnert, Björn" (in German). kicker.de. Retrieved 6 February 2013.
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