The 2003 League of Ireland Premier Division was the 19th season of the League of Ireland Premier Division. The division was made up of 10 teams. Shelbourne were champions.
The 2003 season would see the League of Ireland Premier Division change from a winter league to a summer league. Each team played four rounds of games, totalling 36 games each.
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Four teams entered the promotion/relegation play-off. The second, third and fourth placed teams from the 2003 League of Ireland First Division were joined by the ninth placed team from the Premier Division.
Derry City win 4âÂÂ0 on aggregate
Finn Harps win 3âÂÂ1 on aggregate
Derry City win 2âÂÂ1 on aggregate and retain their place in the Premier Division.