An unhinged man attacked three women — two of them outside a yeshiva — in a random Williamsburg spree late Monday, police said.

Jacob Narvaez, 22, allegedly first targeted a 19-year-old woman who was walking home on Heyward Street near Lee Avenue, slapping her on the buttocks around 9:25 p.m., cops said.

Narvaez then walked about four blocks to Bedford Avenue near Hewes Street, where he allegedly attacked his next two victims about five minutes later in front of a yeshiva, authorities said.

He came up behind one woman and slapped her on the side of her face, and scratched another on her back around 9:30 p.m., according to cops and one of the victims.

The slapped victim, Rachel Paskes, told The Post she was simply walking on the street and talking on the phone when she was clobbered on

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