About O'Connor MacLeod Hanna LLP

O'Connor MacLeod Hanna LLP, known as OMH, is a full-service law firm based in Oakville, Ontario, serving Halton and the wider Greater Toronto Area. The firm traces its roots to 1970, when it was formed as Saul Leitch Hays and later became O'Connor Leitch Hays, while a separate Oakville practice, MacLeod Watts, later became MacLeod Knox Watts around the same period. The two firms combined in 1991 to form O'Connor MacLeod, and lawyer Brian Hanna joined in 2000, giving the firm its current name, O'Connor MacLeod Hanna LLP. OMH now works across six areas: business law, employment and labour, litigation and dispute resolution, municipal and land development law (including expropriation), real estate, and wills, trusts and estates administration.

OMH's municipal and land development lawyers handle zoning, development approvals, and expropriation matters for public bodies, property owners, and businesses. One of the firm's real estate lawyers holds the Certified Specialist designation in real estate law. OMH also runs diversity, equity and inclusion initiatives meant to build a workplace where staff, lawyers, and clients from different backgrounds feel included, and its lawyers take part in United Way campaigns, local chambers of commerce, and other charitable activity across Halton.

In the community

  • OMH supports the United Way of Halton and Hamilton, Kerr Street Ministries, the Burlington Food Bank, the Rotary Club of Oakville West, the Oakville Community Foundation, the Children's Aid Foundation of Halton, and the YMCA of Oakville.
  • The firm sponsored the Oakville Chamber of Commerce's Insight Gala in November 2025 and took part in the United Way's Plane Pull fundraiser in 2025.
  • The United Way of Halton and Hamilton gave OMH an Inspiring Local Love Award for its long term support.
  • OMH sponsors the Professional Services Provider of the Year award at the Oakville Chamber of Commerce's Oakville Awards for Business Excellence.
  • OMH runs an annual internal food drive for local food banks, and its lawyers are involved with the Oakville, Milton, and Burlington chambers of commerce and the Halton County Law Association.

Good to know

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This firm’s lawyers at a glance

Called to the bar
1975–2026 · median 13 years in practice 16 of 18 lawyers
Law schools
Queen's University (2), University of Leicester (2), China University of Political Science and Law, City University of Hong Kong, Lakehead University, Osgoode Hall Law School and 3 more 11 of 18 lawyers
Languages on the roster
Arabic, Armenian, Cantonese, English, French, Mandarin, Spanish

Where to find them

700 Kerr Street, Suite 300, Oakville, Ontario L6K 3W5 · 905-842-8030

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This listing was generated by AI from public sources in September 2026. It may contain errors, and we can’t guarantee it’s accurate or complete. Before you rely on anything here, verify it on the firm’s own website. Verify licence status in the Law Society of Ontario directory ↗

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