San Dionisio is a small municipality in the Matagalpa Department of Nicaragua. It is one of the department's minor administrative divisions, situated in the country's central highlands region.
As a municipality, San Dionisio serves as a local government unit encompassing a central settlement and its surrounding rural areas. Matagalpa Department, to which it belongs, lies in the interior of Nicaragua, north of the capital, Managua.
Detailed information about the municipality's population, geography, economy, and history is limited in available sources. It remains a lesser-known locality within Nicaragua's Matagalpa region.