Chestnut Ridge is a village in the town of Ramapo, Rockland County, New York, United States, located north of the state of New Jersey, east of Airmont, south of Spring Valley, and west of Nanuet. The population was 10,505 at the 2020 census.

Chestnut Ridge was incorporated in 1986. Prior to 1986, Chestnut Ridge was an unincorporated area within the town of Ramapo often referred to as "South Spring Valley" (its fire district), as many postal addresses carried the Spring Valley designation. In April 2020, mayor Rosario Presti appointed Chaim Rose to fill a vacancy on the village board of trustees; Rose thus became the first Hasidic member of the board since the village was incorporated in 1986.

According to the United States Census Bureau, the village has a total area of 4.9 square miles (13 km²), all land.

As of the 2020 census, Chestnut Ridge had a population of 10,505. The median age was 29.3 years. 39.1% of residents were under the age of 18 and 14.8% of residents were 65 years of age or older. For every 100 females, there were 98.6 males, and for every 100 females age 18 and over, there were 93.9 males age 18 and over.

100.0% of residents lived in urban areas, while 0.0% lived in rural areas.

There were 2,633 households in Chestnut Ridge, of which 44.1% had children under the age of 18 living in them. Of all households, 65.5% were married-couple households, 11.6% were households with a male householder and no spouse or partner present, and 20.3% were households with a female householder and no spouse or partner present. About 18.3% of all households were made up of individuals and 12.4% had someone living alone who was 65 years of age or older.

There were 2,780 housing units, of which 5.3% were vacant. The homeowner vacancy rate was 1.4% and the rental vacancy rate was 6.6%.

According to an earlier Census Bureau estimate, the village had 2,107 families, a population density of 1,584.6 inhabitants per square mile (611.8/km²), and a housing-unit density of 526.4 per square mile (203.2/km²).