145 King St W, Suite 2750
Toronto, ON M5H 1J8

416 598 3556

Litigation Star



Terry O’Sullivan’s practice includes civil and commercial litigation, with particular expertise in business-related litigation including contract disputes, shareholder disputes, oppression remedies and securities litigation, as well as financial institution litigation, class actions, defence of regulatory charges and professional discipline matters. Terry also acts as a mediator and an arbitrator and is a Member of the Chartered Institute of Arbitrators (MCIArb).


Terry is widely recognized as one of the top litigators in Canada. He represents clients before all levels of Ontario Courts, the Federal Court, and the Supreme Court of Canada. He is frequently retained and has acted as sole arbitrator, party nominee, chair, and appointed independent fact finder in arbitrations and mediations involving important commercial matters, often of an international nature.


Terry is a Fellow of the American College of Trial Lawyers, a Fellow of the International Academy of Trial Lawyers and a past president of The Advocates’ Society of Ontario. He was a co-author of the Civil Justice Review (volumes one and two) and is former chair of the Joint Committee on Court Reform of the province of Ontario. He writes and speaks extensively and is an occasional lecturer and demonstrator for the Osgoode Hall Intensive Advocacy Program. Terry is a recipient of the Law Society of Ontario’s Medal for his outstanding contribution to the legal profession and is a recipient of the Gold Key Award for Achievement from the Osgoode Hall Law School Alumni Association.


Last updated March 2020