| Province: | Quebec |
| Fed-Status: | active |
| Fed-District-Number: | 24066 |
| Fed-Created: | 1933 |
| Fed-Election-First: | 1935 |
| Fed-Election-Last: | 2021 |
| Fed-Rep: | Simon-Pierre Savard-Tremblay |
| Fed-Rep-Party: | BQ |
| Demo-Pop-Ref: | [1] |
| Demo-Area-Ref: | [2] |
| Demo-Census-Date: | 2011 |
| Demo-Pop: | 99629 |
| Demo-Electors: | 80577 |
| Demo-Electors-Date: | 2015 |
| Demo-Area: | 1948 |
| Demo-Cd: | Acton, Les Maskoutains |
| Demo-Csd: | Saint-Hyacinthe, Acton-Vale, Saint-Pie, Saint-Liboire, Sainte-Marie-Madeleine, Saint-Dominique, La Présentation, Saint-Damase, Sainte-Madeleine, Upton |
Saint-Hyacinthe—Bagot (formerly known as Saint-Hyacinthe and St. Hyacinthe—Bagot) is a federal electoral district that has been represented in the House of Commons of Canada since 1935. It is located in Quebec, Canada. Its population in 2006 was 95,983. In the 2015 election, the winner received the lowest vote percentage of any winning candidate in the country.
The district includes the Regional County Municipalities of Acton and Les Maskoutains. It includes the communities of Saint-Hyacinthe, Acton Vale, Saint-Pie, Sainte-Madeleine, and Saint-Dominique.
Almost all of the riding voted for the Bloc in 2006 except for parts of Roxton Falls and its surrounding township, Roxton which voted Conservative.
The electoral district was created in 1933 from Bagot and St. Hyacinthe—Rouville ridings as "St. Hyacinthe—Bagot". In 1947, the name was changed to "Saint-Hyacinthe—Bagot".
In 1966, the riding was abolished. Parts of the riding were combined with parts of Chambly—Rouville and Richelieu—Verchères riding into a new riding named "Saint-Hyacinthe". Saint-Hyacinthe was renamed "Saint-Hyacinthe—Bagot" after the 1980 election.
After the resignation of Yvan Loubier on 21 February 2007, a by-election occurred on 17 September 2007.
This riding was not changed as a result of the 2012 electoral redistribution.
Following the 2022 federal electoral redistribution the riding will be renamed Saint-Hyacinthe—Bagot—Acton.[3]
This riding has elected the following members of Parliament:
Note: Conservative vote is compared to the total of the Canadian Alliance vote and Progressive Conservative vote in 2000 election.
Note: Social Credit vote is compared to Ralliement créditiste vote in the 1968 election.
Note: Ralliement créditiste vote is compared to Social Credit vote in the 1963 election.
Note: Union des Electeurs popular vote is compared to Social Credit vote in 1945 general election.