Allsvenskan 2003, part of the 2003 Swedish football season, was the 79th Allsvenskan season played.
The first match was played 5 April 2003 and the last match was played 26 October 2003.
Djurgårdens IF won the league ahead of runners-up Hammarby IF, while Östers IF and Enköpings SK were relegated.
2–2 on aggregate.
GIF Sundsvall won on away goals.