The First National Bank at 2201 Trimmier Road in Killeen was robbed at 9:18 a.m. Thursday.
Killeen Police Department spokeswoman Ofelia Miramontez said a black male walked into the bank wearing a black hoodie and a mask, and handed a teller a note.
The teller complied with the demand, giving the suspect money, and he fled with an undisclosed amount of cash.
The KPD Facebook page showed the robber standing in line seconds before the holdup.
The man is described as a black male, 6 feet tall, with a thin build.
Anyone with information is asked to call the Killeen Police Department at 254-501-8830.