The 2003 FIM Sidecarcross World Championship, the 24th edition of the competition, started on 6 April and finished after thirteen race weekends on 7 September 2003. The defending champions were the Latvian's Kristers Sergis and Artis Rasmanis who had won their fifth title in 2002. The 2003 championship was won by Dutch rider Daniël Willemsen and his Latvian passenger Kaspars Stupelis who finished 60 points ahead of the defending champion Sergis and his new passenger Sven Verbrugge in second place. It was the second title for Willemsen, having previously been crowned World Champions in 1999 and the first for Stupelis.