A Manhattan straphanger was slashed and pepper-sprayed by a spurned panhandler early Wednesday, cops said. 

The 57-year-old victim was riding a northbound 1 train between West 42nd and West 50th streets around 1:30 a.m. when another man started begging him for money, authorities said. 

When the rider refused to hand over any cash, the suspect pepper-sprayed him and cut him on the right arm with a knife, cops said. 

The assailant, believed to be in his 20s, got off the train at West 50th Street and has not yet been caught. 

The victim stayed on the train until the next stop, 59th Street–Columbus Circle, where police responded.

He was taken to Mount Sinai West, where he was treated for lacerations and released, authorities said. 

In a separate incident on the rails, a 13-year-old boy was pummeled and robbed on a Brooklyn train on Oct. 3, cops said this week.

The teen victim was riding a Manhattan-bound F train approaching the Avenue P station when a group of guys approached him around 4 p.m., police said. 

The crew of four punched him multiple times in the head and grabbed his backpack and cellphone before taking off, authorities said.

The victim was taken to Maimonides Medical Center in stable condition with bruising to his head and face. 

The young-looking suspects — all wearing backpacks — are shown on surveillance footage released late Tuesday walking on a rainy street. 

Police are still looking to track them down. 

The attacks come amid a recent string of violent attacks in the city’s subway system.

In an unprovoked assault earlier this week, a 49-year-old woman was struck in the head with scissors at the Cathedral Parkway station in Harlem around 2:30 a.m. Monday, authorities said. 

Meanwhile, murders in the subway system since 2020 have skyrocketed to the highest annual levels in 25 years, even amid plummeting ridership numbers.

Most recently, two Big Apple dads — Tommy Bailey, 43, and Charles Moore, 38 — were separately knifed to death in random attacks on their commutes home from work.