| Competition: | League of Ireland Premier Division |
| Season: | 2003 |
| Winners: | Shelbourne (11th title) |
| Relegated: | UCD |
| Continentalcup1: | UEFA Champions League |
| Continentalcup1 Qualifiers: | Shelbourne |
| Continentalcup2: | UEFA Cup |
| Continentalcup3: | UEFA Intertoto Cup |
| Continentalcup3 Qualifiers: | Cork City |
| League Topscorer: | Jason Byrne 21 |
| Prevseason: | 2002–03 |
| Nextseason: | 2004 |
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.[2] [3]
| Player | Club | Goals | |
|---|---|---|---|
 Jason Byrne | Shelbourne | 21 | |
| Glen Crowe | Bohemians | 19 | |
| John O'Flynn | Cork City | 14 | |
| Andrew Myler | Drogheda United | 14 | |
| Tony Bird | St Patrick's Athletic | 14 |
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 4–0 on aggregate
Finn Harps win 3–1 on aggregate
Derry City win 2–1 on aggregate and retain their place in the Premier Division. [4]