An elderly woman was slugged from behind in Manhattan on Friday, the NYPD said.

A suspect punched the 76-year-old victim in the back of the head around 11 a.m. outside 252 West 57th Street and fled toward Eighth Avenue, police said.

Cops said the woman experienced swelling as a result of the attack but declined medical attention.

NYPD released a photo of the suspect, who has not been apprehended.

Anyone with information about the incident can call Crime Stoppers at 1-800-577-TIPS (8477) or, for Spanish, 1-888-57-PISTA (74782).