1989–90 Harty Cup
| Dates | 11 October 1989 – 25 March 1990 | ||
|---|---|---|---|
| Teams | 15 | ||
| Champions | St Flannan's College (15th title) Jamesie O'Connor (captain) | ||
| Runners-up | Nenagh CBS Eddie Tucker (captain) | ||
| Tournament statistics | |||
| Matches played | 16 | ||
| Goals scored | 56 (3.5 per match) | ||
| Points scored | 258 (16.13 per match) | ||
| Top scorer(s) | Conor O'Riordan (2-22) | ||
| |||
The 1989–90 Harty Cup was the 70th staging of the Harty Cup since its establishment by the Munster Council of Gaelic Athletic Association in 1918. The competition ran from 11 October 1989 to 25 March 1990.
St Flannan's College entered the competition as the defending champions.
The final was played on 25 March 1990 at the Gaelic Grounds in Limerick, between St Flannan's College and Nenagh CBS, in what remains their only meeting in the final. St Flannan's College won the match by 0–10 to 0–03 to claim their 15th Harty Cup title overall and a second successive title.
North Monastery's Conor O'Riordan was the top scorer with 2-22.