| Season | 1890–91 |
|---|---|
| Champions |
Linfield 1st Irish title |
| Relegated | none |
| Matches played | 56 |
| Goals scored | 333 (5.95 per match) |
| Top goalscorer | Robert Hill (20 goals) |
| Biggest home win | Linfield 14–0 Oldpark |
| Biggest away win |
Cliftonville 0–8 Linfield Milford 0–8 Glentoran Milford 1–9 Distillery Oldpark 2–10 Ulster |
| Highest scoring |
Linfield 14–0 Oldpark Linfield 9–5 Ulster |
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1891–92 →
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The 1890–91 Irish League was the first year of league football under the Irish Football Association.
For this season, the league used a double Round-robin format, where teams played each other both home and away once.