About Constantine Legal

Constantine Legal is a sole practice in downtown Toronto, operated by Lisa M. Constantine through Lisa M. Constantine Professional Corporation. Before opening the firm, Constantine spent more than 20 years at one of Canada's national law firms, and that background shaped a practice built around commercial litigation, health law and regulated professionals, education law, and administrative tribunals.

The litigation side covers commercial disputes for corporate clients, including multinational companies, Schedule I Canadian banks, insurance companies, and investment brokerages, handled through civil actions and arbitration. A separate line of work is health law: defending physicians and other regulated professionals in civil claims, disciplinary hearings, human rights complaints, and hospital privileges disputes, with appearances before bodies such as the College of Physicians and Surgeons of Ontario and the Health Professions Appeal and Review Board.

For close to two decades the practice has also represented universities in academic and non-academic discipline cases, human rights matters, and Ontario Divisional Court proceedings, work reflected in membership in the Canadian Association of University Solicitors and regular presentations at its annual conference. Constantine Legal also offers general counsel services on a fixed fee or hourly basis, giving businesses ongoing legal support without hiring a full in-house department. Lexpert has recognized Constantine as 'Repeatedly Recommended.'

Milestones & recognition

  • Lexpert has ranked Lisa M. Constantine as 'Repeatedly Recommended.'
  • Member of the Canadian Association of University Solicitors, presenting regularly at its annual conference and to individual member universities.
  • Practised more than 20 years at a national Canadian law firm before founding an independent practice.

Good to know

A person using a wheelchairWheelchair accessible

Fees & payment

A price tag with a dollar signFlat feeA clock beside gold coins with a dollar signHourly

The neighbourhood

Constantine Legal's office is at 1235 Bay Street, a 10 storey building from 1972 at the corner of Bay Street and Yorkville Avenue. The block sits inside Toronto's Yorkville district. It's a smaller standalone office building rather than one of the large bank towers further south on Bay Street, a setting that suits a sole practice serving corporate, institutional, and professional clients across the city.

Frequently asked questions

What areas of law does Constantine Legal handle?
Commercial litigation, health law and regulated professionals, education law, administrative law and tribunals, and general counsel services for businesses.
Does Constantine Legal represent universities in discipline or human rights matters?
Yes. The firm has represented universities for close to 20 years in academic and non-academic discipline cases, before the Ontario Human Rights Tribunal, and on judicial review at the Ontario Divisional Court. Lisa M. Constantine is a member of the Canadian Association of University Solicitors.
Can Constantine Legal defend a physician or other regulated professional facing a complaint or discipline hearing?
Yes. The firm has defended physicians and other regulated professionals in civil actions, disciplinary proceedings, human rights claims, and hospital privileges disputes, with appearances before bodies such as the College of Physicians and Surgeons of Ontario, the Ontario College of Pharmacists, and the Health Professions Appeal and Review Board.
Does the firm handle commercial litigation and arbitration for businesses?
Yes. Constantine Legal has represented corporate clients, including multinational companies, Schedule I Canadian banks, insurance companies, and investment brokerages, in civil actions and arbitrations over commercial disputes.
Does Constantine Legal provide ongoing general counsel support instead of taking on a single case?
Yes. The firm offers general counsel services on a fixed fee or hourly basis, including second opinion advice and ongoing oversight of internal legal issues, so a business can rely on outside counsel without building a full in-house team.
Where is Constantine Legal's office and how do I get in touch?
The office is at 1235 Bay Street, 5th Floor, Toronto, in the Yorkville area. The firm can be reached by phone at 416 903 7556 or by email at Lisa@ConstantineLegal.ca.

Where to find them

1235 Bay St., 5th Floor, Toronto, ON M5R 3K4 · 416-903-7556

Similar firms in City of Toronto

Berger Law Firm

1 lawyer · Est. 2008

The Berger Law Firm, also known as the Law Offices of Ken J. Berger, is a Toronto litigation firm serving businesses, healthcare providers, professionals and individuals in administrative law, civil litigation, health…

Administrative & Regulatory LawAdministrative & Regulatory LawCivil Litigation & Dispute ResolutionCivil Litigation & Dispute ResolutionHealth LawHealth LawCriminal DefenceCriminal Defence

Litigationworks

1 lawyer · Est. 2013

Litigationworks is a team-based litigation practice founded by Michael Alexander in 2013, collaborating with lawyers in Ontario, Alberta, British Columbia, and New York State. The firm handles public and private law m…

Civil Litigation & Dispute ResolutionCivil Litigation & Dispute ResolutionAdministrative & Regulatory LawAdministrative & Regulatory LawHealth LawHealth LawEmployment & Labour LawEmployment & Labour Law

ACL Law

1 lawyer

ACL Law is the Ontario litigation and regulatory practice of Carina Lentsch, a lawyer licensed with the Law Society of Ontario. It focuses on defending regulated health professionals in College complaints, investigati…

Administrative & Regulatory LawAdministrative & Regulatory LawHealth LawHealth LawCivil Litigation & Dispute ResolutionCivil Litigation & Dispute Resolution

Listing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗