Atty. John Polyzogopoulos
John helps clients solve their business and personal disputes: Corporate and Commercial Litigation - Business partner and shareholder disputes, breach of contract, environmental contamination disputes, franchise disputes, debt collection, commercial tenancy disputes, construction disputes, real estate disputes, product liability, bankruptcy and receiverships Estate Litigation - Disputes between heirs/beneficiaries and executors/estate trustees Sports Law - representing amateur hockey and other sport organizations from the local to the national level, as well as athletes regarding internal gove
Corporate And Commercial Litigation Attorney
Profile Summary
About John Polyzogopoulos at a Glance
John Polyzogopoulos is a business and litigation attorney, practicing at Blaney McMurtry LLP. Recognitions include Best Lawyers in America — Corporate and Commercial Litigation (2026).
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About John Polyzogopoulos
John helps clients solve their business and personal disputes:
- Corporate and Commercial Litigation - Business partner and shareholder disputes, breach of contract, environmental contamination disputes, franchise disputes, debt collection, commercial tenancy disputes, construction disputes, real estate disputes, product liability, bankruptcy and receiverships
- Estate Litigation - Disputes between heirs/beneficiaries and executors/estate trustees
- Sports Law - representing amateur hockey and other sport organizations from the local to the national level, as well as athletes regarding internal governance, discipline and dispute resolution
- Family Business Litigation – Corporate divorce between spouses when both their business and marriage partnerships dissolve
John helps clients resolve their disputes in a variety of ways:
- Court proceedings, private arbitrations and other tribunals
- Negotiation
- Mediation
John’s court and tribunal experience:
- Supreme Court of Canada
- Ontario Court of Appeal, Divisional Court and Superior Court
- Nunavut Court of Justice
- Administrative tribunals
- Private arbitrations
Other types of matters John helps his clients with:
- Appeals – John can assist with appeals before the Ontario Court of Appeal and other appellate courts
- Professional Negligence and Discipline – accountants, lawyers, engineers, real estate agents, financial advisors, insurance brokers, dental hygienists and others
- Defamation and Breach of Privacy
- Enforcing Foreign Judgments and Jurisdictional Issues
- Fraud
- Injunctions and other Extraordinary Remedies
John is the editor of the firm’s blog entitled “Blaneys Appeals”, which is dedicated to summarizing all civil law decisions released by the Court of Appeal for Ontario on a weekly basis. The blog receives several thousand reads a month and is circulated widely through various legal information media, including Mondaq, Lexology, CanLii and the Ontario Bar Association website.
John also co-authored two chapters in Civil Procedure and Practice in Ontario, 2nd ed (CPPO), published by the Canadian Legal Information Institute (CanLII). CPPO is a free online annotated version of Ontario’s Rules of Civil Procedure. John also edits the firm’s Commercial Litigation Update newsletter.
Practice Areas Explained
John Polyzogopoulos's Areas of Legal Practice
Each practice area below reflects the types of cases John Polyzogopoulos handles, with a practical overview of what that area of law involves and how it may apply to your situation.
Business & Corporate Law
Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.
John Polyzogopoulos is one of 497,491 business attorneys indexed nationally. Browse business attorneys →
Civil Litigation
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
John Polyzogopoulos is one of 450,751 litigation attorneys indexed nationally. Browse litigation attorneys →
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Professional Profile
Why Clients in Your Area Choose John Polyzogopoulos
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish John Polyzogopoulos's practice in the field of business and litigation.
Broad Practice Area Coverage
Covering business and litigation, John Polyzogopoulos can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Transparent Client Communication
Clients consistently note that understanding what is happening in their case — and why — is as important as the outcome itself. John Polyzogopoulos maintains clear, timely communication throughout every matter.
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