A food deliveryman was struck by a stray bullet when a street fight nearby escalated to gunfire this week in Brooklyn, cops said. 

The 35-year-old worker — who was working for an unspecified online delivery service — was waiting for a pick-up when he was shot in the right leg on Thornton Street near Broadway in Williamsburg around 3:30 p.m. Monday, authorities said.

A large group of people was fighting when one of them flashed a gun and fired about two rounds — one of them inadvertently striking the deliveryman, police said. 

He was taken to Woodhull Medical Center in stable condition. 

The crowd dispersed and the alleged shooter — shown in photos released late Thursday — took off and was last seen on Whipple Street. 

Police are still looking to track him down. 

Cops say he has dark eyes, dark hair and a heavy build.