2003 League of Ireland First Division
The 2003 League of Ireland First Division season was the 19th season of the League of [Ireland First Division] and the first to be played as a summer league.
Overview
The First Division was contested by 12 teams and Dublin [City F.C.|Dublin City] won the division. Each team played the other teams three times, totaling 33 games.Promotion/relegation play-off
Four teams entered the promotion/relegation play-off. The second, third and fourth placed teams from the First Division were joined by the ninth placed team from the 2003 [League of Ireland Premier Division].Semi-final
;1st Legs;2nd Legs
Derry City win 4–0 on aggregate
''Finn Harps win 3–1 on aggregate''