Mongillo Law Professional Corporation is a family law firm based in Markham that serves clients across York Region, Toronto, Durham, Peel, and Halton. Leonardo Mongillo opened the practice in 2015 after working at a boutique Toronto family law firm since 1999, and the firm handles divorce, custody, and support matters. It also offers mediation, arbitration, and collaborative family law services.

Practice areas

Good to know

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

Who handles what

Where to find them

445 Apple Creek Boulevard, Suite 202, Markham, Ontario, L3R 9X7 · 905-291-1022

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