Kellner Avocats is a law firm based in Sainte-Thérèse, Quebec, with an additional office in Montréal, serving clients on the North Shore of Montréal. The firm practises family law, business and commercial law, civil litigation, real estate and construction law, and tax law, and has grown from a solo practice founded in 2003 to a team of more than a dozen lawyers.

Practice areas

Family Law Business & Corporate Law Civil Litigation & Dispute Resolution Real Estate Law Construction Law Wills, Estates & Trusts Administrative & Regulatory Law Tax Law Bankruptcy & Insolvency

Good to know

A person using a wheelchairWheelchair accessibleA calendar with a checkmark beside a clockBy appointment

Lawyers 12

Amélie Bourgault-Albert Avocate, Droit de la famille Family Law Arnaud Drouin Avocat, Droit civil Civil Litigation & Dispute Resolution Benoit Guindon Avocat, Droit de la construction et litiges immobiliers Construction LawReal Estate Law Catherine Deschênes-Ouimet Avocate et médiatrice accréditée, Droit de la famille Family Law Gabrielle Pagliuca Avocate, Droit civil et droit de la famille Civil Litigation & Dispute ResolutionFamily Law Isabelle Pepin Avocate, Droit civil Civil Litigation & Dispute Resolution Jessica Sirois Avocate, Droit civil et administratif Civil Litigation & Dispute ResolutionAdministrative & Regulatory Law Karine Martineau Avocate, Droit civil, successions et droit des personnes Civil Litigation & Dispute ResolutionWills, Estates & Trusts Mathieu Kellner Avocat, Droit des affaires Business & Corporate Law Maxime Morissette Avocat, Droit des affaires Business & Corporate Law Michel Corbeil Avocat, Droit des affaires Business & Corporate Law Mike-Randy Fontus Avocat, Droit des affaires Business & Corporate Law

This firm’s lawyers at a glance

Languages on the roster
French

Who handles what

Where to find them

15 Rue St-Charles, Sainte-Thérèse, QC J7E 2A3 · 450-506-0285

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Listing compiled from the firm’s public website in August 2026. Verify licence status in the Barreau du Québec directory ↗