Police are looking for a man who allegedly attacked a Queens bartender when she refused to serve him drinks.

Investigators say it happened the night of September 18 at the J-Jack Bar Room on Sanford Avenue in Flushing.

They say the man grabbed the 38-year-old victim by the hair and hit her in the head with a glass when she refused to serve him because he failed to pay his previous tab.

The man then ran out of the bar, according to investigators.

The victim was taken to Flushing Hospital, where she received stitches on her head.

The man is described as being between 45 and 50 years old and was last seen wearing a black-and-white baseball cap, a dark-colored shirt and light-colored shorts.

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.