Toronto Public Health says there were 113 cases as of Dec. 6 — more than three times the 10-year seasonal average.
There have been 342 in total in the province, a figure nearly double the 182 this time last year.
Public Health Ontario says 120 people have been hospitalized and three have died from influenza.
Most of those cases are over 65.
Toronto Public Health says the count is expected to peak around the end of the month.