The robbery happened at 11:35 a.m. Wednesday at the First Niagara Bank, located at 11730 Bustleton Avenue.
According to police, the suspect entered the bank, approached the counter and presented the teller with a threatening demand note.
The suspect was given an undisclosed amount of money and then fled on foot south along Bustleton Avenue.
The suspect is described as a black male, 30 to 40 years-of-age, standing 5'9", medium build, and goatee. He was wearing a white hooded sweatshirt, tan/khaki pants, and a black baseball hat.
If you have any information that could aid in the investigation you are asked to contact authorities at 215-686-TIPS (8477) or text a tip to PPD TIP or 773847.