A man was stabbed in the back while waiting for a train on a Manhattan subway platform, police said.

The victim, 30, was knifed at the southbound “4” train station platform at East 59th Street and Lexington Avenue shortly after 1 a.m. Saturday, cops said.

He was taken to Weill Cornell Medical Center in stable condition, but was uncooperative with police, authorities said.

Cops are looking for two suspects. There are no arrests.

Police on Saturday were also looking for a hazmat suit wearing gunman who shot dead an Upper East Side deli worker late Friday night.