The shooting happened around 10:15 a.m. at the Winchester Playground on the 2300 block of North 15th Street.
Arriving officers found two males suffering from gunshot wounds.
A 16-year-old was shot in the right hand.
A 31-year-old was shot once in the knee.
A 26-year-old male fell and suffered minor scrapes to his right wrist. He was not shot.
The two shooting victims are in stable condition at Temple University Hospital.
No arrests have been made.
Police say the gunman may have been wearing a ski mask.
Anyone with information is asked to contact Philadelphia Police.