The discovery was made around 9:25 a.m. in the 600 block of East Hilton Street.
He was pronounced dead a short time after being found.
Authorities are now working to learn the man's cause of death.
No details have been released about the man's identity.
Anyone with information is urged to contact the Philadelphia Police Department Homicide Unit at 215-686-3334 or leave an anonymous tip at 215-686-TIPS.