A bald creep groped the same 13-year-old girl twice in two weeks aboard two different trains, police said.

The first encounter happened at about 7:15 a.m. Feb. 12 while the teen was riding the northbound 7 line in Queens, police said.

When the train pulled into Queensboro Plaza, the man — whom police described as partially bald, 5 feet 8 to 5 feet 10 and about 200 pounds — touched the teen’s upper inner thigh.

Two weeks later, the girl reported almost the same incident — this time on the 5 train.

When the train approached the 86th Street subway station in Manhattan at about 7:15 a.m. Feb. 22, the perv touched the girl’s upper thigh, police said. He exited the train near 149th Street and Grand Concourse in the Bronx.