The victim was attacked at the Zerega Avenue station in Parkchester just before 11:35 p.m.
He was slashed on the left side of his face.
The victim took the number 6 subway train to the Castle Hill Avenue station, where he was met by an ambulance and taken to Jacobi Hospital in stable condition.
The suspect, a man wearing a black hooded sweatshirt, fled the scene.
So far, no arrests have been made.
----------
* More Bronx news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube