Saint-Théodore-d’Acton (Saint Theodore of Acton) is a municipality in the Regional County Municipality of Acton, in the province of Quebec, Canada.

Within this municipality there is a small village, with the same name.

In terms of legal jurisdiction, the village is part of the larger municipality and has no separate identity.

The rest of the municipality is completely rural.

Population trend:[5] Mother tongue language (2006)[6]