Can a foreign (non-Canadian) corporation operate in Ontario?

Yes. A corporation incorporated in a foreign country (outside of Canada) can carry on business in Ontario, but it must register as an extra-provincial corporation through the Ontario Business Registry. The registration process requires filing an application, providing a certified copy of the corporation's constitutional documents from its home jurisdiction (translated into English or French if necessary), and designating a registered agent in Ontario for service of process.

The foreign corporation must also confirm its name is available for use in Ontario — if its foreign name is confusingly similar to an existing Ontario business name, it may need to operate under a different name in Ontario.

Once registered, the foreign extra-provincial corporation must maintain an Ontario registered address, file annual returns in Ontario, and comply with Ontario and federal business laws. Common examples include US-incorporated businesses expanding into Ontario, or subsidiaries of global companies established in Cayman Islands, Delaware, or other offshore or foreign jurisdictions.

Note that registering as an extra-provincial corporation does not change the corporation's tax residency. A foreign corporation operating in Canada will have Canadian tax obligations under federal income tax law, and potentially Ontario corporate minimum tax obligations, even if it is not incorporated here. Tax advice specific to cross-border operations should be sought from an accountant with international tax experience.