| Competition: | Irish League |
| Season: | 1938–39 |
| Winners: | Belfast Celtic 12th Irish title |
| Matches: | 182 |
| Total Goals: | 837 |
| Prevseason: | 1937–38 |
| Nextseason: | 1939–40 |
The 1938–39 Irish League was the 45th edition of the Irish League, the highest level of league competition in Northern Irish football. The league comprised 14 teams, and Belfast Celtic won the championship.