The Sauber C23 was designed by Sauber for the 2004 Formula One season. It was driven that season by Giancarlo Fisichella, who had swapped from Jordan with Nick Heidfeld, Felipe Massa and (in testing only) test driver Neel Jani. It had a 3.0 litre 90 degree normally aspirated V10 Ferrari engine, (badged as a Petronas). The fuel also came from Petronas and the car raced with Bridgestone tyres.

Giancarlo Fisichella scored the most championship points with 22 with a best finish of 4th place at the Canadian Grand Prix while Felipe Massa scored 12 points also with a best finish of 4th place at the Belgian Grand Prix. The team scored 34 points overall and 6th place in the Constructors' Championship.