Authorities are hunting for a serial holdup man they call the “Snubnose Bandit,” the FBI said.

The gunman is believed to be responsible for five heists, including the robbery of an Apple Bank in Clinton Hill yesterday morning.

The bandit’s crime spree — which has struck neighborhoods in Brooklyn and Queens — began when he knocked over a Dunkin’ Donuts in Greenpoint on Sept. 25.

He has stolen tens of thousands of dollars altogether, a law-enforcement source said.

The bandit — who got his nickname because of his snubnose revolver — is around 35 years old, 5-foot-6 and between 150 and 190 pounds.