| 1940 Limerick Senior Hurling Championship | |
| Champions: | Croom |
| Count: | 5 |
| Runners-Up: | Ahane |
| Previous Year: | 1939 |
| Previous Tournament: | 1939 Limerick Senior Hurling Championship |
| Next Year: | 1941 |
| Next Tournament: | 1941 Limerick Senior Hurling Championship |
The 1940 Limerick Senior Hurling Championship was the 46th staging of the Limerick Senior Hurling Championship since its establishment by the Limerick County Board in 1887.
Ahane were the defending champions.
Croom won the championship after a 4–02 to 3–01 defeat of Ahane in the final.[1] It was their fifth championship title overall and their first title since 1929. It was Ahane's first defeat in the championship since 1932.