Can I go after a corporate director personally to enforce a judgment against their company in Ontario?

Generally, no — not automatically. A core principle of Ontario corporate law is that a corporation is a separate legal entity from its directors and shareholders, meaning a judgment against the company generally can't simply be enforced against a director's personal assets just because they run or own the business. A creditor can't collect a corporate judgment by garnishing a director's personal bank account or seizing their personal property based solely on the fact that the debt belongs to a company they control.

There are, however, specific and narrower situations where a director may face personal exposure — for example, where a director personally guaranteed the company's debt, where they've engaged in certain kinds of wrongful conduct such as fraud, or in specific statutory circumstances where directors can be held personally responsible for particular kinds of corporate obligations. Reaching a director personally generally requires establishing one of these specific legal bases separately, rather than simply having an unpaid judgment against their company and deciding to pursue the director instead. Because these exceptions are narrow and fact-specific, a creditor considering this route should get legal advice on whether a genuine basis actually exists before assuming a director can simply be substituted for a judgment-proof company.