It happened around 3:00 Sunday morning at the Gold Coast Lounge on the 4000 block of Lancaster Avenue.
Police say the bar had just closed and several people were still inside.
Initial reports indicate that a fight broke out on the second floor and spilled down to the first floor.
Three men between the ages of 18-20 were each shot in the leg.
The victims were taken to the Hospital of the University of Pennsylvania in stable condition.
So far no arrests have been made.