Björn Karl Michael Wirdheim (born 4 April 1980 in Växjö, Sweden) is an auto racing driver. Wirdheim is the son of Örnulf Wirdheim, a Swedish racing driver. He began racing karts, competing in his first race, at the age of 10. His main achievement to date is becoming the International Formula 3000 Champion in 2003.

He began racing karts at age ten, until the age of fifteen, winning the Southern Swedish Karting Championship. In 1996, he progressed to single-seaters in Swedish Formula Ford 1600 Junior Championship were he took the championship title in 1997 with staggering 17 wins. In 1998 and 1999 he raced in the Formula Palmer Audi Championship, but they were two disappointing seasons with only two visits to the podium in total.

In 2000, he switched to the German Formula Three Championship. Then, during 2001 in addition to winning at Nürburgring and A1-Ring, he took three pole positions including one at Macau Grand Prix. For the season of 2002 Björn Wirdheim switched once again, this time to International Formula 3000, joining Arden International. He finished fourth overall, in addition to being named Rookie of the Year, and helping Arden to win the team title in the championship.