A creep groped a 14-year-old girl on a Queens train before following her out of the station this week, cops said early Thursday. 

The teen was on a northbound M train approaching Steinway Street in Astoria around 8 a.m. Wednesday when the man sitting behind her touched her thigh and buttocks over her clothing, authorities said. 

Once the train pulled into the station, both the victim and suspect disembarked, cops said. 

The perv followed the teen out of the station and tried to chat her up, but she fled for her safety, police said. 

The suspect then took off as well, cops said. Police released a photo of him walking on Steinway Street.

The victim did not report any injuries.