The Caterham CT03 is a Formula One racing car designed by Mark Smith and Lewis Butler for the Caterham F1 team. It was used during the 2013 Formula One season, where it was driven by Charles Pic and Giedo van der Garde. The car was unveiled on the eve of testing for the 2013 season at the Circuito de Jerez.

The Caterham F1 Team was a Malaysian, later British owned Formula One team based in the United Kingdom which raced under a Malaysian licence. The Caterham brand competed in the Formula One World Championship from 2012 to 2014, following the acquisition of British sportscar manufacturer Caterham Cars by former owner and team principal Tony Fernandes, forming the Caterham Group.