River Grove is a village in Leyden Township, Cook County, Illinois, United States.

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.

[2][3] James Kirie (1911–2000), businessman and Illinois state representative, was born in River Grove.

In 2011, in a competition of 64 stands across the country, it was chosen by the magazine Every Day with Rachael Ray and the food blog Serious Eats as the best hot dog in America.

Pace provides bus service on multiple routes connecting River Grove to destinations across the region.