Three high level sex offenders have been arrested in separate Manhattan subway stations the past two days, police sources said.

Transit cops inside the Times Square subway station on Thursday cuffed the first fiend, Ralph Hargrove.

While on patrol they recognized his face from a forcible touching wanted poster, sources said.

The 62-year-old creep, who has 13 prior arrests, was carrying a gravity knife and drug paraphernalia when he was busted.

The same day, officers followed a known offender onto a 5 train and witnessed him rub his genitals against a woman’s buttocks, police sources said.

When the train arrived at the Union Square station, Rodney Pierre was placed under arrest.

Rodney has 8 prior arrests – all sex crimes – dating back to 1992, sources said.

Then Friday, another transit cop witnessed a sex offender in action on a train at the 59th Street-Columbus Circle station.

This pervert, identified as Jeffrey Taylor, 52, also rubbed up against a woman’s behind, police sources said.

Taylor, who has 39 prior arrests, was arrested without incident.

All of the men are registered level 3 sex offenders, the most dangerous.