The incident occurred around 1:34 a.m. at T’s Bar & Restaurant at 5025 North Clark Street, near Clark and Winnemac, according to police dispatch reports.
Investigators said two Hispanic males were involved in the stabbing.
One offender was wearing a gray shirt and the other suspect was wearing a bright yellow shirt, said police.
Investigators said one of the assailants was carrying a backpack.
After the stabbing, both suspects fled the scene northbound on Clark Street.
As of 1:51 a.m., the offenders were still at large.
Police did not offer a motive for the North Side stabbing.