An alleged serial pervert wanted for groping or flashing at least 10 women across northern Brooklyn since April is in custody, thanks to one of his eagle-eyed victims, who spotted the creep and called the cops.

The quick-thinking woman called 911 on Thursday morning after she spotted Joshua Griffith near Metropolitan Avenue and Humboldt Street in Williamsburg and recognized him as the man who allegedly flashed her days earlier, cops said.

Officers nabbed Griffith, 20, and have since linked him to nine other incidents in the immediate area, authorities said.

His spree began around 7:30 a.m. April 22, when he exposed himself to a woman near the intersection of Humboldt Street and Jackson Avenue, according to cops.

Police said his most recent strike came at 12:50 a.m. June 3, when he allegedly flashed a woman at North Henry Street and Engert Avenue.

Authorities are asking any other women who believe they may be a victim to come forward.

Griffith, of Brownsville, was charged with multiple counts of sexual abuse, forcible touching, and public lewdness.