John P. Mullen Law Office
1 lawyer · Peel Region
One of 570 law firms listed in Mississauga, and one of 192 handling Civil Litigation & Dispute Resolution.
1 lawyer · Peel Region
One of 570 law firms listed in Mississauga, and one of 192 handling Civil Litigation & Dispute Resolution.
John P. Mullen Law Office is a solo commercial litigation practice based in Mississauga, Ontario. The office is run by lawyer John Mullen, who was called to the Ontario Bar in 1978 after earning a B.A. from York University and an LL.B. from Osgoode Hall Law School. The practice concentrates on construction, commercial, employment, estate, and real estate litigation, acting for clients that range from sole proprietors and family owned businesses to financial institutions and multinational corporations.
On the construction side, the firm has represented suppliers, equipment rental companies, subcontractors, general contractors, owners, and lenders in disputes over liens and contract claims. Its commercial litigation work has included shareholder, franchise, and partnership disputes, along with cases interpreting commercial leases and agreements for the purchase and sale of property. In employment matters the firm acts for both employers and employees on wrongful dismissal claims and disputes over non-competition and non-solicitation clauses, and its estate litigation practice covers contested wills, the interpretation of wills and trusts, and questions of mental incapacity or undue influence.
Mullen has also instructed on business law at Sheridan College and at Wilfrid Laurier University, and has taught bar admission and continuing education courses for the Law Society of Upper Canada.
Wheelchair accessible
By appointmentJohn P. Mullen Law Office works out of a suite at 106-218 Export Boulevard in Mississauga. The office serves businesses, financial institutions, and property owners in connection with the firm's construction, commercial, and real estate litigation practice.
106-218 Export Blvd. Mississauga, ON L5S 0A7 · 905-501-8778
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Construction LawListing compiled from the firm’s public website in September 2026. Verify licence status in the Law Society of Ontario directory ↗