| William Heffernan III | |
| State House: | Connecticut |
| District: | 115th |
| Term Start: | January 23, 2024 |
| Predecessor: | Dorinda Keenan Borer |
| Party: | Democratic |
| Residence: | West Haven, Connecticut |
William Heffernan III is an American politician. He is a Democratic member of the Connecticut House of Representatives serving in the 115th district since 2024.[1]