Diana Oliveira

Diana provides timely, clear, concise and practical legal advice. She’s responsive and accessible and takes time to understand her clients, earning their loyalty as a trusted advisor.

Diana Oliveira, lawyer, Marta Watson LLP

Which of your cases makes you proudest of the result?

It’s finding a way through the most difficult files that another lawyer might not want to touch. Justice demands that all sides are vigorously represented. That’s fundamental to our profession.

What do you think the most important factor is in resolving a file?

Making sure that you can see the bigger picture. It is important to step back from the file to get a real appreciation of what the crux of the issue is so that a resolution is properly formulated around the real issue. I feel that this culminates in the best possible resolution. Whether the route is negotiation, mediation or trial.

What’s the most valuable lesson that your professional experience has taught you?

That you have to run every file as if it is going to proceed to trial. Each step in the litigation process needs to be carefully thought out with a view to trial.


Clients select Diana for her responsiveness, cost effective counsel and creativity.

Diana’s practice focuses on insurance defence litigation. She represents clients at the Divisional Court, Superior Court of Justice, Court of Appeal and License Appeals Tribunal. Providing timely, clear, concise and practical legal advice, being responsive and accessible and taking the time to understand her clients has earned her the loyalty of her clients as a trusted advisor.

She articled and practised at two very well-respected insurance defence firms before joining Marta Watson LLP.

Throughout her academic career, Diana was awarded numerous scholarships and awards for her academic achievement and community service.

She is a member of the Law Society of Ontario, the Canadian Bar Association, the Ontario Bar Association, The Advocates’ Society and the Toronto Lawyers Association. She is an executive board member of the Portuguese-Canadian Lawyers Association and is on the Board of Directors at Working Women Community Centre.

Education and Credentials

  • Called to the Ontario Bar, 2012
  • LL.B., University of Ottawa, 2011

Other Language Spoken

  • Portuguese

Diana Oliveira

Law Clerk
Alethia Fleuelling

Legal Assistant
Heather Gordon