The park, run by the Fairfax County Park Authority, is located at 7400 Georgetown Pike in McLean.
Fairfax County Police confirmed Tuesday morning that the body of a teenage boy was found at Scott's Run Nature Preserve on Monday afternoon at about 1:15 p.m.
"We feel there is no public safety threat," said police spokeswoman Lucy Caldwell, who confirmed that a body was found.
A cause and manner of death were to be determined.
If you or someone you know is in crisis, the phone number of the National Suicide Prevention Lifeline is 1-800-273-8255.