Police are searching for a creep who pleasured himself in front of a horrified woman inside the Upper West Side’s 103rd Street subway station Sunday morning.

The unidentified pervert approached the 31-year-old woman on the A train platform around 9 a.m. and began masturbating in front of her, cops said.

He also directed a sexually explicit comment toward the woman before fleeing the scene, police said.

The victim was not physically harmed from the startling encounter.

The suspect is about 30-40 years old and roughly between 5-foot-5-inches and 5-foot-7-inches tall, the NYPD said.

He was last seen wearing light blue shorts, a gray hat, white sneakers and a dark colored jacket.