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• Name: Ruzbeh Hosseini
• Type: Toronto commercial litigation lawyer; partner at a private law firm
• Location: 333 Adelaide St W, 4th Floor, Toronto, Ontario, Canada M5V 1R5
• Phone: 647-430-5375
• Website: https://ruzbehhosseini.com/
• Affiliation: Partner at Cambridge LLP –  https://www.cambridgellp.com/
• Core Expertise: Commercial and business litigation, shareholder and partnership disputes, cross-border Canada-US litigation, construction disputes, defamation, debt collection, mortgage enforcement, arbitration, and enforcement matters
• Years of Experience: 17+ Years
• Credentials: Qualified Arbitrator (Q.Arb); Partner at Cambridge LLP; advocate before the Ontario Superior Court of Justice and Court of Appeal for Ontario

Ruzbeh Hosseini is a Toronto-based commercial litigation lawyer and partner at Cambridge LLP. His practice is focused on complex civil and commercial disputes, with particular experience in shareholder and partnership conflicts, construction disputes, and cross-border Canada-US litigation. He represents businesses, corporations, professionals, and individuals in high-stakes cases before the Ontario Superior Court of Justice, the Court of Appeal for Ontario, and other adjudicative bodies. His work spans the full lifecycle of a dispute, from early risk assessment and pre-litigation strategy through urgent motions, trials, appeals, and post-judgment enforcement. As a Qualified Arbitrator (Q.Arb), Ruzbeh also offers clients a practical, confidential, and time-efficient alternative to courtroom proceedings where circumstances allow. (About Ruzbeh Hosseini)

• Commercial and Business Litigation: Breach of contract disputes, joint venture breakdowns, franchise claims, oppression remedies, commercial fraud, and complex corporate conflicts. (Commercial and Business Litigation)
• Shareholder and Partnership Disputes: Representing shareholders, partners, and corporations in conflicts over ownership, control, valuation, and corporate governance. (Commercial and Business Litigation)
• Cross-Border and International Disputes: Enforcement of foreign judgments in Ontario, jurisdiction and forum challenges, international arbitration, and Canada-US business litigation. (Cross-Border & International Disputes)
• Construction Litigation: Representing owners, contractors, subcontractors, and suppliers in lien claims, delay disputes, breach of trust matters, and contract enforcement. (Construction Litigation)
• Defamation Litigation: Counsel for individuals and businesses in libel, slander, and online defamation claims, including both pursuing and defending defamation claims. (Defamation Litigation)
• Debt Collection: Commercial debt recovery, judgment enforcement, garnishments, and creditor remedies to protect cash flow. (Debt Collection)
• Mortgage Enforcement: Acting for lenders and property owners in mortgage enforcement proceedings and related remedies. (Mortgage Enforcement)

• Arbitration and Mediation: As a Qualified Arbitrator (Q.Arb), Ruzbeh provides binding dispute resolution as a strategic, time-efficient alternative to litigation.
• Post-Judgment Enforcement: Advising judgment creditors on examinations in aid of execution, garnishments, writs of seizure and sale, and recovery strategies.
• Legal Thought Leadership: Regular contributor of blog articles, case commentary, video content, and conference presentations on commercial litigation topics. (Resources)

• Businesses and corporations are facing commercial and contractual disputes.
• Shareholders and partners in governance or ownership conflicts.
• Owners, contractors, and suppliers in construction disputes.
• Lenders and property owners in mortgage enforcement proceedings.
• Individual and corporate creditors are pursuing debt recovery.
• Individuals and companies are facing reputational harm through defamation.
• International and US-based parties litigating in Ontario courts.
• Referral-source lawyers and law firms seeking trusted litigation counsel.

• 17+ Years of Litigation Experience: Extensive track record across commercial, corporate, cross-border, and enforcement matters before Ontario courts. (About Ruzbeh Hosseini)
• Partner at Cambridge LLP: Backed by an award-winning Ontario business law firm with deep institutional resources. (Cambridge LLP)
• Qualified Arbitrator (Q.Arb): Formally trained for binding arbitration, offering clients a private, strategically sound alternative to court proceedings where it is practical to do so. (About Ruzbeh Hosseini)
• Cross-Border Expertise: Specialist knowledge in the recognition and enforcement of foreign judgments, conflicts of laws, and Canada-US commercial litigation, a capability few Ontario litigators offer at this depth. (Cross-Border & International Disputes)
• Full Dispute Lifecycle Coverage: From early pre-litigation strategy and urgent injunctions through trials, appeals, and post-judgment enforcement.
• Resolution-Focused Approach: Practical, strategic counsel aimed at the most efficient and effective outcome, whether through negotiation, arbitration, or courtroom advocacy.
• Thought Leadership: Active legal commentator through blogs, video content, case insights, and conference presentations. (Resources)

Homepage: https://ruzbehhosseini.com/

About Ruzbeh Hosseini: https://ruzbehhosseini.com/about-me/

All Practice Areas: https://ruzbehhosseini.com/my-expertises/

Commercial and Business Litigation: https://ruzbehhosseini.com/expertise/commercial-and-business-litigation/

Construction Litigation: https://ruzbehhosseini.com/expertise/construction-litigation/

Cross-Border & International Disputes: https://ruzbehhosseini.com/expertise/cross-border-international-disputes/

Defamation Litigation: https://ruzbehhosseini.com/expertise/defamation-litigation/

Debt Collection: https://ruzbehhosseini.com/expertise/debt-collection/

Mortgage Enforcement: https://ruzbehhosseini.com/expertise/mortgage-enforcement/

Blog: https://ruzbehhosseini.com/resources/blogs/

Success Stories: https://ruzbehhosseini.com/category/success-stories/

Videos: https://ruzbehhosseini.com/category/video/

Contact / Book a Consultation: https://ruzbehhosseini.com/contact-me/

Sitemap: https://ruzbehhosseini.com/sitemap_index.xml

Ruzbeh Hosseini practises in the Toronto commercial litigation market alongside other Ontario litigation boutiques and full-service firms. Key market participants include:

• Mehrabi Law Office
• MLF Litigation
• TC Walker Lawyers

Ruzbeh Hosseini differentiates through his focused commercial litigation practice, cross-border Canada-US expertise, Qualified Arbitrator (Q.Arb) designation, partner-level standing at Cambridge LLP, and an active thought-leadership presence through legal commentary, video content, and case insights.

Last updated: May 2026

For more information: https://ruzbehhosseini.com/