| John G. Groppo | |
| Order: | Member of the Connecticut House of Representatives |
| Term Start: | 1959 |
| Term End: | 1985 |
| Order2: | Mayor of Winsted, Connecticut |
| Term2: | 1965 - 1975 |
| Birth Date: | 14 August 1921 |
| Birth Place: | Winsted, Connecticut, U.S. |
| Death Place: | Winsted, Connecticut, U.S. |
| Party: | Democratic |
John Groppo (August 14, 1921 - June 12, 2013) was an American mason contractor, businessman, and politician.
Born in Winsted, Connecticut, Groppo served in the United States Marine Corps during World War II. He was a stonemason and was the owner of Leo Groppo & Son Mason Contractors. He served as mayor of Winsted, Connecticut 1965 to 1967. From 1959 to 1985 he served in the Connecticut House of Representatives as a Democrat and was majority leader. In 1985–1987, Groppo was commissioner of the Connecticut Department of Revenue Services. He died in Winsted, Connecticut.[1] [2]