The shooting happened at 2:38 a.m. at the Classico Bar on Jerusalem Avenue in Uniondale.
Police say a man armed with a handgun fired several shots. striking the 23-year-old victim in the arm and face.
The victim was transported to a local hospital and is listed in stable condition.
The subject who fled on foot eastbound on Jerusalem Avenue is described as a male Hispanic, wearing a green shirt, a green backpack and dark colored pants.
Detectives ask anyone with information about the shooting to call Nassau County Crime Stoppers at 1-800-244-TIPS. All callers will remain anonymous.