One incident happened at the Taste of the Danforth festival on Danforth Avenue west of Pape Avenue shortly after 1 a.m.
A man was stabbed multiple times, according to paramedics.
Around the same time, another stabbing happened in the area of Yonge Street and Finch Avenue.
A 21-year-old man was stabbed multiple times on William Carson Crescent. His injuries are non-life-threatening.
Police have not yet made any arrests in either stabbing.