Police are looking for a creep who allegedly fondled a man on the subway in the Upper West Side.

The unknown man walked up behind a 28-year-old on the northbound 3 train just before noon on June 6 and allegedly grabbed the man’s genitals, police said Thursday.

The handsy man quickly moved to another train after the grope while near the 72nd Street station and got off at the 96th Street station, cops said.

The NYPD released a photo of the suspect Thursday.