A man robbed an 84-year-old woman this week inside a Union Square bank, cops said.

The woman was withdrawing cash from an ATM inside Amalgamated Bank on 14th Street around 1:46 p.m. Monday when the stranger walked up behind her, police said.

The man put his arm around her neck and snatched the $80 she had just withdrawn from her hands, cops said.

He ran out of the bank and fled into the Union Square subway station, police added.

The victim was taken to Lenox Hill Hospital for minor injuries.

The suspect was last seen wearing a blue sweatshirt and a black jacket with “Joey Place” stitched on the back. Anyone with information is asked to call the NYPD’s Crime Stoppers Hotline at 1-800-577-TIPS (8477).