| Province: | Ontario |
| Prov-Status: | defunct |
| Prov-Created: | 2006 |
| Prov-Abolished: | 2018 |
| Prov-Election-First: | 2007 |
| Prov-Election-Last: | 2014 |
| Demo-Census-Date: | 2006 |
| Demo-Pop: | 123706 |
| Demo-Electors: | 93620 |
| Demo-Electors-Date: | 2011 |
| Demo-Area: | 2652 |
| Demo-Cd: | Durham |
| Demo-Csd: | Quinte West, Northumberland |
Northumberland—Quinte West was a provincial electoral district in Ontario, Canada, that was represented in the Legislative Assembly of Ontario between the 2007 provincial election and the 2018 provincial election. Its population in 2001 was 118,906.
The district includes the County of Northumberland and the City of Quinte West.
The electoral district was created in 2003: 86.1% of the riding came from Northumberland riding and 13.9% from Prince Edward—Hastings riding. In 2018, the riding was dissolved into Northumberland—Peterborough South and Bay of Quinte.
|align="left" colspan=2|Liberal hold|align="right"|Swing|align="right"| +3.51|
^ Change is from redistributed results
| 2007 Ontario electoral reform referendum | ||||
|---|---|---|---|---|
| Side | Votes | % | ||
| First Past the Post | 32,392 | 67.2 | ||
| Mixed member proportional | 15,834 | 32.8 | ||
| Total valid votes | 48,226 | 100.0 | ||