Sainte-Eulalie is a municipality in the Nicolet-Yamaska RCM in the Centre-du-Québec region of Quebec, Canada, situated at the crossroads of Autoroutes 55, 20 and 955. The population as of the Canada 2021 Census was 984.

Sainte-Eulalie is also the home of Hydro-Québec's Nicolet static inverter station along Autoroute 20, west of its junction with Autoroute 55, as part of its HVDC Quebec - New England Transmission circuit.

Population trend:

Census	Population	Change (%)
2021	984	10.1%
2016	894	2.6%
2011	871	2.6%
2006	894	1.1%
2001	884	0.6%
1996	879	7.9%
1991	815	N/A

Mother tongue language (2021)

Language	Population	Pct (%)
French only	950	96.4%
English only	10	1.0%
Both English and French	5	0.5%
Other languages	15	1.5%

• List of municipalities in Quebec