1989–90 League of Ireland First Division
| Season | 1989–90 | 
|---|---|
| Champions | Waterford United | 
| Promoted | Sligo Rovers | 
| European Cup Winners' Cup | Bray Wanderers | 
| Top goalscorer | John Ryan: 16 (Bray Wanderers)  | 
← 1988–89  1990–91 →   | |
The 1989–90 League of Ireland First Division season was the fifth season of the League of Ireland First Division.