| Competition: | Irish League Premier Division |
| Season: | 2002–03 |
| Winners: | Glentoran 21st Irish title |
| Matches: | 228 |
| Total Goals: | 597 |
| League Topscorer: | Vinny Arkins (29) |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
The 2002–03 Irish League was the 102nd edition of the Irish League, the highest level of league competition in Northern Irish football. The league consisted of 12 teams, and Glentoran won the championship.
During matches 1–22 each team plays every other team twice (home and away).
During matches 23–33 each team will play every other team for the third time (either at home, or away).
During matches 34–38 each team will play every other team in their half of the table once. As this is the fourth time that teams play each other this season, home sides are chosen so that they will have played each other twice at home and twice away.
| Competition: | Irish League First Division |
| Winners: | Dungannon Swifts |
| Promoted: | Dungannon Swifts Ballymena United Limavady United Larne |
| Relegated: | Bangor Carrick Rangers Ballyclare Comrades Armagh City |
| Matches: | 112 |
| Total Goals: | 377 |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
Newry Town, who finished in the relegation play-off place, faced Bangor, the 5th-placed team in the First Division, in a two-legged tie for a place in next season's Irish Premier League.
----Newry Town won 2–1 on aggregate