Kerri Aherne, 43, of Massachusetts, was charged with attempted murder, assault and criminal possession of a weapon, the NYPD said.
A 38-year-old woman from California was stabbed multiple times inside of the Macy's just before 3 p.m. in the back and arm. She was at the store shopping with her husband.
The victim was taken to Bellevue Hospital in stable condition.
A Macy's spokesperson released a statement saying, "We are deeply saddened about the incident that took place today as the safety of our customers and colleagues is our top priority. We kindly defer any further questions to the local authorities."
Police say the attack appeared to be unprovoked.
* Get Eyewitness News Delivered
* Follow us on YouTube
* More local news
* Send us a news tip
* Download the abc7NY app for breaking news alerts