Police are asking for the public’s help in identifying a man they say masturbated in front of a woman while on a Queens train over the weekend.

On April 30, between 10:30 p.m. and 11:09 p.m., a man sat across from the 26-year-old victim while onboard a southbound F train at the Northern Boulevard subway station, according to authorities.

The suspect — described as a Hispanic man in his 50s — then masturbated while he stared at the woman, cops said. Investigators released photographs of the man in hopes of identifying him.

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Police described the man as 5 feet 8 inches tall, 180 to 200 pounds and last seen wearing a black jacket, green and black plaid shirt, and light-colored pants. He was also allegedly carrying a beige messenger bag.

Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).

The public can also submit their tips by logging onto the Crime Stoppers website or by texting their tips to 274637 (CRIMES) then enter TIP577.