Atty. Peter N. Mantas
Peter Mantas leads Fasken’s London and Ottawa litigation teams, the firm’s Procurement group, and co-leads its White Collar Defence and Investigations group. Peter is a litigation partner with over 30 years' experience in complicated, high stakes cases before national and international courts, tribunals and arbitration panels.
Profile Summary
About Peter N. Mantas at a glance
Peter N. Mantas is a business, litigation, adr, and international attorney based in Ottawa, Ontario, practicing at Fasken. Recognitions include Best Lawyers in America — Corporate and Commercial Litigation (2026), Best Lawyers in America — International Arbitration (2026), and Best Lawyers in America — Public Procurement Law (2026). Serands clients in Ottawa, ON and the surrounding metropolitan area.
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About
- Peter Mantas leads Fasken’s London and Ottawa litigation teams, the firm’s Procurement group, and co-leads its White Collar Defence and Investigations group
- Peter is a litigation partner with over 30 years' experience in complicated, high stakes cases before national and international courts, tribunals and arbitration panels
- Clients appreciate Peter’s knowledge, strategic advice, teamwork and tough but reasonable approach
- He is also valued for his skill in negotiations, crisis management and media relations
- Peter is sought after for his experience in disputes involving government, mining, trade, procurement and technology, in civil and criminal matters, and in cases involving political and geopolitical issues
- From debating complex issues of law before an international arbitral panel, to cross examining difficult witnesses in an 8-month criminal jury trial, to finding a novel path towards a negotiated settlement affecting thousands of people, Peter has significant experience and a strong track record
Practice Areas Explained
Peter N. Mantas's Areas of Practice
Each practice area below reflects the types of cases Peter N. Mantas handles, with a brief overview of what that area of law covers.
Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.
Peter N. Mantas is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Ontario →
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Peter N. Mantas is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Ontario →
Mediators and arbitrators for civil, commercial, family, and employment dispute resolution.
Peter N. Mantas is one of 73,906 adr attorneys indexed nationally. Browse adr attorneys in Ontario →
International law attorneys for cross-border transactions, trade, foreign investment, and treaties.
Peter N. Mantas is one of 40,133 international attorneys indexed nationally. Browse international attorneys in Ontario →
Jurisdictional Context
Why local counsel matters in Ontario
Practicing law in Ontario. Legal matters in Ontario are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Ottawa are typically filed in the local municipal court or the appropriate Ontario state district court, depending on subject matter and amount in controversy. An attorney licensed in Ontario brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Ontario courts without local counsel or pro hac vice admission.
Looking for additional Ontario attorneys? Browse all attorneys in Ottawa or all attorneys in Ontario.
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