Two men were stabbed in separate attacks just 10 minutes apart in Manhattan early Thursday – including one knifed four times on board a subway train, police said.

In the first assault, a 52-year-old man was riding a northbound No. 1 train around 2:20 a.m. when he got into a scuffle with a stranger at the 42nd Street-Times Square station, cops said. 

The attacker — a man who cops described as having a dark complexion and wearing a white T-shirt — stabbed the victim four times in the head, authorities said.

He then ran out of the station and onto the street.

The victim was taken to Bellevue Hospital, where he was listed in stable condition. 

The NYPD did not immediately know what sparked the violent clash. 

Then around 2:30 a.m., a 51-year-old man was knifed in the stomach by a man who snatched his wallet in front of 500 Fifth Avenue, a skyscraper located across from Bryant Park, near the West 42nd Street intersection, police said. 

He was also taken to Bellevue, where he was listed in stable condition. 

The suspect ran off after the attack.

The stabbings came hours after another incident just blocks away in which a 17-year-old boy allegedly punched a cop who tried to arrest him, authorities said. 

The officer was trying to cuff the boy, and an accomplice, also 17, for a prior assault when the teen socked him in the face at Broadway and West 40th Street around 10:30 p.m. Wednesday, cops said. 

The cop suffered a bloody lip and was treated by EMS workers. 

Both teens were arrested and charges against them were pending, cops said.