A woman swung a butcher’s knife at a fellow patron’s head during a whopper of a squabble in a Bronx Burger King, cops said Tuesday.

The incident happened just before 1:30 p.m. Feb. 26 at the Melrose fast food joint at 149th Street near Brook Avenue, police said.

A 28-year-old woman who works at a local clinic was arguing with a former patient when the assailant pulled the knife and swung it at her, police said.

The knife-wielding woman missed, then fled the restaurant, according to police.