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This article is missing information about the ongoing teacher's strike and dispute relating to Bill 115 and the teacher's union. Please expand the article to include this information. Further details may exist on the talk page.(December 2012)
The Ontario Secondary School Teachers' Federation (OSSTF) is a trade union which represents 60,000 members across Ontario, Canada.
Founded in 1919, its membership includes public high school teachers, occasional teachers, teaching assistants, psychoeducational consultants, social workers, child and youth counsellors, speech-language pathologists, continuing education teachers, instructors and support staff from several Ontario universities.