Ontario Secondary School Teachers' Federation

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.

Ontario Secondary School Teachers' Federation

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.