| Cornelius T. Finnegan Jr. | |
| State House: | Massachusetts |
| District: | 15th Middlesex |
| Term Start: | January 1957 |
| Term End: | January 6, 1965 |
| Predecessor: | James O'Dea Jr. |
| Successor: | John J. Desmond |
| Birth Date: | 13 December 1918 |
| Birth Place: | Lowell, Massachusetts |
| Death Place: | Chelmsford, Massachusetts |
| Alma Mater: | Suffolk University |
| Party: | Democratic |
| Spouse: | Anne O'Sullivan |
| Allegiance: |  United States |
| Branch: | United States Marine Corps |
| Rank: | Sergeant |
| Battles: | World War II |
Cornelius Thomas Finnegan Jr. (December 13, 1918 – September 29, 2006) was an American lawyer and politician who served in the Massachusetts House of Representatives.[1]