McDonnell Park is a county park in unincorporated Central St. Louis County[broken anchor], between the cities of Overland, St. Ann, Creve Coeur and Maryland Heights, in the U.S. state of Missouri.

McDonnell Park was originally referred to as the Adie Road Parksite when purchased in 1977.

In 1980 the name was officially changed to James S. McDonnell Memorial County Park in honor of the late founder of McDonnell Douglas.

Park facilities can be rented for reunions, weddings and other activities.

McDonnell Park has been host to the annual Fords Unlimited Car Show for over 20 years.