The incident happened on Saturday, October 22 just after 5pm in the Nathan Phillips Square area, near Bay and Queen streets.
According to police, a man was involved in a verbal altercation in which he allegedly head-butted, spat at and pushed another person before fleeing the scene in an unknown direction.
The suspect is described as five-foot-nine, about 33 years old, and about 190 pounds with a medium build and a medium-length beard.
He was last seen wearing a gray baseball cap, a gray long-sleeved shirt under a gray t-shirt with a white print on the chest area, gray pants and dark boots and carrying an Iranian flag.
Anyone with information should contact police at 416-808-5200 or Crime Stoppers anonymously at 416-222-8477 (TIPS) or www.222tips.com.