Matthias Ahrens (born 26 May 1961) is a former German biathlete, cross-country skier and current coach.

After his active career as an athlete he became a cross-Country ski and biathlon coach.

In 2004, he became a member of Biathlon Canada's coaching staff at the National Training Centre in Canmore, Alberta.

[1] In this role he coached two athletes to World Cup race wins: Jean-Philippe Leguellec in 2012[2] and Nathan Smith in 2015.

Since then, the Canadian team achieved its first ever male World Championship medal, won by Nathan Smith in the 2015 Biathlon World Championships, followed by a bronze medal at the 2016 World Championships in Oslo in the 4x7.5 km men's relay with Christian Gow, Nathan Smith, Scott Gow and Brendan Green.