| Competition: | Irish League |
| Season: | 1988–89 |
| Winners: | Linfield 40th Irish title |
| Matches: | 182 |
| Total Goals: | 520 |
| League Topscorer: | Stephen Baxter (17) |
| Prevseason: | 1987–88 |
| Nextseason: | 1989–90 |
The 1988–89 Irish League was the 88th edition of the Irish League, the highest level of league competition in Northern Irish football. The league consisted of 14 teams, and Linfield won the championship.