Americans sued in Ontario are at risk. Sometimes these defendants ignore Ontario law suits because they have no assets in Canada. That may be unwise. Ontario courts, under certain circumstances, will assume jurisdiction and grant judgments against American defendants. Such judgments may be enforceable in the US under private international law and the principles of comity. Americans named as defendants in Ontario litigation should contact competent lawyers in both jurisdiction to strategize about how to deal with litigation commenced in a court in Canada.