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Peter Mantas Ottawa Lawyer

Peter N. Mantas

Partner | Co-leader, Procurement Fasken
In an increasingly complex business world, the risk of running afoul of the law, both at home and abroad, cannot be underestimated.
Jurisdiction Ontario, 1994 | New York, 1993
Office(s) Ottawa, Toronto

Peter Mantas is the co-leader of the firm’s Procurement group and the White Collar Defence and Investigations group and head of the Ottawa litigation group. An experienced litigation lawyer, and member of the Bars of Ontario and New York, Peter Mantas has acted in some of the most prominent cases in the country.

In his litigation practice, Peter has particular expertise in proceedings involving government, media, emerging technologies, mining, transportation and trade. His experience covers corporate/commercial, administrative and criminal cases, including jury trials. Peter has appeared before numerous judicial bodies and tribunals including the Supreme Court of Canada, the superior courts of Ontario, numerous provincial and territorial courts across Canada, the Federal Court of Canada, the Canadian International Trade Tribunal, and international and domestic arbitration panels.

Clients appreciate Peter’s careful preparation, strategic advice and tough but reasonable approach. Frequently retained to represent clients in high-profile matters, he is valued for his understanding of reputational risk, media relations and crisis management. He is an avid user and proponent of technology in the litigation process in order to reduce costs and achieve better results, and has considerable experience in cases involving a large and complex documentary record.

Peter’s expertise has been recognized by Chambers, Benchmark Litigation, Legal 500 Canada and Lexpert. He has been nominated in Canadian Lawyer magazine as one of the 25 most influential lawyers in Canada.



  • Recognized in Public Procurement Law in the 2020 edition of The Best Lawyers in Canada, The Best Lawyers in Canada 2020
  • Recognized nationwide in Public Procurement, Chambers Canada 2016 to 2020
  • Legal 500 2019, Legal 500 2019
The Best Lawyers in Canada Recognized in Public Procurement Law in the 2020 edition of The Best Lawyers in Canada
Chambers Canada Recognized nationwide in Public Procurement Chambers Canada covers lawyers and law firms practicing in all provinces and territories in Canada.


  • LLB University of Ottawa
  • BA, Trinity College University of Toronto

Community involvement

Memberships & Affiliations

  • Member of the Executive 2012-17 (Co-Chair, 2015-16) Class Actions Section, Ontario Bar Association
  • Member, Canadian Bar Association
  • Member, American Bar Association
  • Member, Country of Carleton Law Association
Article Commentary: Anti-corruption rules watered down for US miners The Northern Miner
Article President Trump and Congress Water Down Anti-Corruption Rules for U.S. Mining Companies White Collar Post
Article CASL 2017: The Sleeping Giant Awakens Capital Perspectives
Panelist White Collar Crime: Prosecution and Enforcement Matters Eighth Annual London White Collar Crime Institute location location LN, United Kingdom
Speaker Doing Business with Blacklisted Companies Toronto Symposium (9th Edition) location location Toronto, ON
Moderator CETA Enhancing Transatlantic Trade Toronto Region Board of Trade location location Toronto, ON, Canada


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