The FBI on Thursday promised a “significant reward” to anyone with information that leads to the capture of a gun-toting serial bank robber in Queens.

The pistol-packing crook, seen in these surveillance photos, has knocked over at least a dozen banks in Sunnyside, Ridgewood, Jackson Heights, East Elmhurst and Astoria over a seven-month stretch in 2014, the feds said.

Wearing a Yankees baseball cap, the tall, heavyset thief typically lumbered into the banks, approached a teller and passed a note demanding cash, the feds said.

In five of the robberies, he flashed a gun, but never used it, authorities said.

During each of the stick-ups, a teller allegedly gave him an unspecified amount of money before he dashed out of the bank.

He last struck at a Chase Bank at 74-04 Elliot Ave. on Dec. 9, 2014, the feds said.

Prior to that, he allegedly robbed three other Chase banks located at 77-01 31st Ave., 47-11 Queens Blvd. and 69-55 Grand Ave.

He also held up a Dime Savings Bank at 75-23 37th Ave. and a Santander bank at 89-01 Northern Blvd., authorities said.