Northridge is an unincorporated community in Harrison Township in Montgomery County, Ohio, United States.

It was delineated as a census-designated place (CDP) for the 2000 census, at which time its population was 8,487.

Northridge suffered serious damage in the tornadoes that struck the Dayton, Ohio area on May 27, 2019.

[3][4] According to the United States Census Bureau, the CDP had a total area of 2.3 square miles (6.0 km2), all land.

24.2% of all households were made up of individuals, and 8.5% had someone living alone who was 65 years of age or older.