The robbery occurred at the Bank of the West located at 307 Diablo Road around 9:10 a.m.
The suspect handed a note demanding money to the teller, then fled. He was last seen heading north on West El Pintado Road.
He was described as a white man with a slender build, standing roughly 5 feet 8 inches tall. He apparently had a fake beard painted on his face and was wearing black pants with a black shirt and a camouflage backpack.
Anyone with additional information about the robbery is asked to call Danville police at (925) 820-2144.