Cops are searching for an unknown creep who pushed a woman’s head toward his crotch in the lobby of a Brooklyn apartment building, police said Wednesday.

The perv allegedly walked into the building on Newkirk Avenue in Flatbush on around 3:30 a.m. Oct. 4, shoved one hand in his pants and used the other to push the 25-year-old woman’s head toward his groin, cops said.

The woman shoved the creep away, and he ran out of the building, taking off on a bicycle down Newkirk Avenue toward E. 18 Street, according to police.

The NYPD released a video of the suspect Wednesday.