The 2003–04 Irish Premier League was the 103rd edition of the Irish League, the highest level of league competition in Northern Irish football.
For this season there was a change from the structure of previous seasons, with the First Division reverting to intermediate status and the new Premier Division being renamed as the Irish Premier League.
The league consisted of 16 teams, and Linfield won the championship.
Cliftonville, the club that finished in the relegation play-off place, faced Armagh City, the runners-up of the 2003–04 Irish First Division in a two-legged tie for a place in next season's Irish Premier League.
Cliftonville won 4–1 on aggregate