Police say the victim, a 17-year-old female, was walking near Kipling Avenue and Albion Road at about 12:45 p.m. on Feb. 12.
She was followed, attacked and sexually assaulted in front of an apartment building, police allege, after which the suspect fled on foot northbound on Kipling Avenue.
The suspect is described as a black man, between 25 and 30 years old, six feet two inches tall, and with a medium build. He was wearing a black tuque, black jacket and blue jeans.
Anyone with information is urged to call police at (416) 808-7474 or Crime Stoppers at (416) 222-TIPS.