| Competition: | Irish League |
| Season: | 1912–13 |
| Winners: | Glentoran 5th Irish title |
| Relegated: | Derry Celtic Tritonville |
| Matches: | 90 |
| Total Goals: | 267 |
| Prevseason: | 1911–12 |
| Nextseason: | 1913–14 |
The 1912–13 Irish League was the 23rd edition of the Irish League, the highest level of league competition in Irish football.
The league comprised 10 teams, and Glentoran won the championship.