The first happened Friday morning at Popular Community Bank on Delancey Street on the Lower East Side.
Police say less than half an hour later, the same man robbed a Capital One Bank on East 34th Street.
In both incidents, he handed the tellers a note demanding $7,000, and threatening them with a gun.
He took off with a little more than $2800 after both robberies. There were no injuries in either incident.
The suspect is described as a black male, approximately 5'8" tall, weighing 165 lbs., with a medium build. He was last seen wearing a gray skull cap, black jacket, black hooded sweatshirt, black jeans, black shoes and black sunglasses.
Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS (8477).
The public can also submit their tips by logging onto the Crime Stoppers website at WWW.NYPDCRIMESTOPPERS.COM <http://WWW.NYPDCRIMESTOPPERS.COM> or by texting their tips to 274637 (CRIMES) then enter TIP577.