Cops are looking for a sicko accused of groping a 13-year-old girl aboard a Bronx subway last week, police said Thursday.

The girl was heading north on a 4 train around 5:00 p.m. on Aug. 6.

As the train approached the 149th Street station, a strange man reached out and touched the girl’s inner thigh and “intimate area” before running off the train and out of the station when the train stopped, according to the NYPD.

Cops said the alleged pervert is still on the loose.

They described him as heavy-set with a medium complexion and released a photo of him wearing a blue shirt, black pants and a Yankees cap.