The 2009 Swedish Touring Car Championship season was the 14th Swedish Touring Car Championship (STCC) season. It was decided over nine race weekends (comprising eighteen races) at six different circuits.
Tommy Rustad won the drivers' championship for the second time. The ethanol powered Volvo C30 of Polestar Racing proved to be the fastest car over one lap, as evidenced by them setting all fastest qualifying times during the season (although grid penalties ruined the perfect score), but they were plagued by bad reliability. Instead, Thed Björk, driving for Flash Engineering, lead the championship most of the season, only to be overtaken in the last race.
The team championship also went down to the wire, with Polestar Racing besting WestCoast Racing by one point in the last race.
The entry of the Biogas.se team with their Volkswagen Scirocco meant the debut of a biogas powered car in STCC. Unfortunately, they had trouble matching the pace of the other factory teams and ended up last in the team championship.