What does OSSTF stand for?

Ontario Secondary School Teachers' Federation

This definition appears very rarely and is found in the following Acronym Finder categories:

Organizations, NGOs, schools, universities, etc.

Other Resources:

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Samples in periodicals archive:

Lump all three captions together and one gets the drift of what Earl Manners, the vitriolic president of the Ontario Secondary School Teachers' Federation, said in his keynote address to his union's leadership meeting on August 24.

Earl Manners - ill manners

An enemy of Catholic schools, the Ontario Secondary School Teachers' Federation, is trying to entice these Catholic principals and vice principals to join a new association which it will control behind the scenes.

Will Ontario's Catholic schools survive the next 25 years?