Cops are on the hunt for a sicko who allegedly masturbated in front of a woman on a 6 train, police said Thursday.

The NYPD says a 28-year-old woman was seated on the northbound train at 125th Street and Lexington Avenue on Sept. 6 at around 10 p.m. when the creep started pleasuring himself “in full view of the victim.”

When the train doors opened at the next stop, the perv ran off the subway car.

Police released photos of a suspect wanted for questioning in connection to the lewd act.

The suspect is described by cops as between 20 and 30 years old.