| Petit-Saguenay | |
| Flag Size: | 120x100px |
| Pushpin Map: | Canada Lac-Saint-Jean Quebec |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location in Saguenay–Lac-Saint-Jean Quebec |
| Coordinates: | 48.2167°N -74°W |
| Subdivision Type: | Country |
| Established Title: | Settled |
| Established Title1: | Constituted |
| Established Date1: | August 12, 1919 |
| Named For: | Petit Saguenay River[1] |
| Government Footnotes: | [2] |
| Leader Title: | Mayor |
| Leader Name: | Thérèse Gaudreault |
| Area Footnotes: | [3] |
| Area Total Km2: | 337.10 |
| Area Land Km2: | 334.57 |
| Population Total: | 634 |
| Population As Of: | 2016 |
| Population Density Km2: | 1.9 |
| Population Blank1 Title: | Pop (2011–16) |
| Population Blank1: | 12.8% |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 378 |
| Utc Offset: | −5 |
| Utc Offset Dst: | −4 |
Petit-Saguenay is a municipality in the Canadian province of Quebec, located in Le Fjord-du-Saguenay Regional County Municipality. The municipality, located on Route 170 near L'Anse-Saint-Jean, had a population of 727 in the Canada 2011 Census, which dropped to 634 in the 2016 census.