The 2005 Swedish Touring Car Championship season was the 10th Swedish Touring Car Championship (STCC) season. In total eight racing weekends at six different circuits were held; each round comprising three races, making a twenty-four round competition in total.

Changes for 2005

• The race format of qualifying and two races per weekend were removed. Instead two short sprints would be raced, and the combined results of those two races would determine the grid for the third, longer race.
• Points were awarded for the top six grid positions for the long race (the six drivers that succeeded the most in the qualification races): 6-5-4-3-2-1.
• The longer race gave points by the system 20-17-14-11-9-7-5-3-2-1.
• Grid positions for the first qualification race was decided by randomly drawing the driver's starting numbers from a cup. This grid was then reversed for the second qualification race. The drawings were later replaced by a one-lap shootout for the quickest time after teams put preassure on the organisation.
• Extra ballast weight were given to the top four drivers of the championship and the top four long race winners by the system 1st: +20 kg, 2nd: +15 kg, 3rd: +10 kg and 4th: +5 kg. Maximum extra weight was set to 40 kg. Weight gained from the long race stayed for one weekend after the gaining of the weight and was then removed from the car.
• Tyres were limited to 20 slick tyres per weekend, whereof 8 of these 20 were allowed to be new tyres.
• TV coverage was extended, with Viasat Sport/ZTV covering three and a half hours live action from each race weekend
• STCC AB had a board change. Mike Luff, Sven-Göte Svensson, Håkan Junfors and Lars Frisell were replaced by Tommy Theorin, Joakim Wiedesheim and Christer Johansson.

Teams and drivers

C = Challenge

Driver	Nat.	Team	Car	Class
Richard Göransson		West Coast Racing	BMW 320i
Thed Björk		West Coast Racing	BMW 320i
Robert Dahlgren		Polestar Racing	Volvo S60
Edward Sandström		Polestar Racing	Volvo S60
Fredrik Ekblom		Kristoffersson Motorsport	Audi A4
Tommy Kristoffersson		Kristoffersson Motorsport	Audi A4
Tommy Rustad		Opel Team Sweden	Opel Astra
Jan Nilsson		Flash Engineering	BMW 320i
Tomas Engström		Engström Motorsport	Honda Accord
Jens Hellström		Engström Motorsport	Honda Civic Type-R
Johan Stureson		IPS Motorsport	Peugeot 407
Mattias Andersson		Team Italienska Bil	Alfa Romeo 156
Tobias Johansson		Mercedes-Benz Sport	Mercedes C200
Hans Simonsson		Mercedes-Benz Sport	Mercedes C200
Daniel Haglöf		Team Agrol	Honda Civic Type-R
Christer Gellerstedt		Gellerstedt Motorsport	BMW 320i	C
Johan Nilsson		JN Racing	BMW 320i	C
Joakim Gustavsson		Team Gustavsson	Volvo S60	C
Ronnie Brandt		Mälarpower	Volvo S40 Evo 5	C
Håkan Johansson		Johansson Motorsport	BMW 320 D E46	C
Patrik Andersson		Budda Racing	Volvo S60	C

Race calendar and winners

Championship results

Driver's championship

STCC Challenge

Manufacturer's championship