| Campolongo Maggiore | |
| Official Name: | Comune di Campolongo Maggiore |
| Pushpin Label Position: | left |
| Coordinates: | 45.3333°N 15°W |
| Metropolitan City: | Venice (VE) |
| Mayor Party: | Futuro Comune |
| Mayor: | Alessandro Campalto |
| Area Total Km2: | 23.54 |
| Population Footnotes: | [1] |
| Population Total: | 10156 |
| Population As Of: | 30 April 2009 |
| Population Demonym: | Campolongari |
| Saint: | St. Felix and St. Fortunatus |
| Day: | 14 May |
| Postal Code: | 30010 |
| Area Code: | 049 |
| Istat: | 027003 |
| Frazioni: | Campagna Lupia, Camponogara, Fossò, Piove di Sacco (PD), Sant'Angelo di Piove di Sacco (PD), Bojon, Liettoli, Santa Maria Assunta |
Campolongo Maggiore is a town in the Metropolitan City of Venice, Veneto, Italy. It is northeast of SS516.
The Cunetta Brenta separates the principal village from Bojon, the main frazione.
Campolongo Maggiore is governed by a centre-left political party.
It is notorious for being the hometown of Felice Maniero, former boss of the criminal organization Mala del Brenta.