Witnesses say at 11 a.m. Saturday, a black male in his mid 30's came into the Carter Bank and Trust on Main Street and gave a teller a note demanding money.
Police say the suspect grabbed the money and took off on foot.
The suspect was between 5' 7" and 5'10", and weighs about 150 pounds. He was wearing a back shirt, jean shorts, and sunglasses.
Anyone with information is asked to contact the South Boston Police Department.