The assault occurred at about 6:28 p.m. Monday on the 'Q' train platform.
The victim, a man in his 40s, was slashed in the back, according to cops. The suspect then took off and was not caught.
The victim was treated at a hospital and released.
Get breaking news alerts in the FOX5NY News app. Download for FREE!
Anyone with information about the slashing is encouraged to contact the NYPD Crime Stoppers at any of the following: 1-800-577-TIPS (8477). The public can also submit their tips by logging onto the Crime Stoppers website at WWW.NYPDCRIMESTOPPERS.COM, or on Twitter @NYPDTips.
Police say all calls are strictly confidential.