River Grove is a village in Leyden Township, Cook County, Illinois, United States. The population was 10,612 at the 2020 census. It is part of the Chicago metropolitan area.

Just as nearby Elmwood Park and Oak Park are named after their historic elm and oak trees, River Grove gets its two-part name first from the community's shallow, muddy Des Plaines River, and second from the majestic groves of American ash trees lining shore of the river's "bottomland." Credit goes to the village's early German and Nordic settlers who, already holding a great reverence for the "mystic ash" through old world traditions, felt that they were home again among the familiar groves of ash trees, "just like the ones they left behind." Up until the modern day extinction event of the American ash tree species 2006–2018, River Grove was the home to Cook County's second-oldest green ash with an estimated age of 240 in the "old growth" Lafrombose Woods, along with several other living examples of locally evolved white, green, black and blue ash types 110–160 years of age scattered around the village. Because the invasive Asian emerald ash borer kills off young trees long before they reach seeding age of 10, scientists theorize that the "Fraxinus/ash" species will no longer be able to germinate continued generations by 2018 within the local woods, or only 12 years after EAB was first discovered in River Grove.

James Kirie (1911–2000), businessman and Illinois state representative, was born in River Grove.

River Grove is located at 41°55′33″N 87°50′24″W / 41.92583°N 87.84000°W / 41.92583; -87.84000 (41.925830, -87.840135). According to the 2010 census, River Grove has a total area of 2.39 square miles (6.19 km²), all land.

As of the 2020 census, River Grove had a population of 10,612. The median age was 40.4 years. 19.5% of residents were under the age of 18 and 15.7% of residents were 65 years of age or older. For every 100 females there were 95.2 males, and for every 100 females age 18 and over there were 92.9 males age 18 and over.

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

There were 4,304 households in River Grove, of which 28.8% had children under the age of 18 living in them. Of all households, 43.8% were married-couple households, 20.3% were households with a male householder and no spouse or partner present, and 29.4% were households with a female householder and no spouse or partner present. About 29.8% of all households were made up of individuals and 12.3% had someone living alone who was 65 years of age or older.

There were 4,482 housing units, of which 4.0% were vacant. The homeowner vacancy rate was 0.9% and the rental vacancy rate was 3.6%.