The man is suspected in at least four robberies that took place over a span of about three weeks from late October to mid-November.
In several instances the suspect walked into the bank, handed a teller a stick up note demanding money and indicated he had a gun. In at least three robberies, he showed the teller the gun which in all cases was a black handgun.
During one robbery, he threatened to kill a teller if she did not comply with his demand for money.
The suspect is described as being between five-feet, 11-inches and six-feet, two-inches tall and 45 to 60 years old. In all of the robberies he wore sunglasses, leather gloves and a hooded jacket and carried a tan-colour carrying case.
Police have released security camera footage that shows the man walking into a bank before one of the robberies.
Police believe he is armed and dangerous, and ask any members of the public with potentially important information to contact them at 416-808-7350.
On mobile? Click here to watch the security camera footage