What is the Hague Convention and how does it affect serving a lawsuit on someone abroad from Ontario?

The Hague Service Convention is an international treaty that sets out an agreed process for formally delivering legal documents between countries that have signed on, including Canada. When an Ontario lawsuit needs to be served on a defendant in another member country, the Convention generally requires going through that country's designated "central authority," rather than simply mailing or personally delivering documents the way you would within Ontario. The central authority receives the documents, arranges for service in a manner recognized as valid under that country's own law, and confirms back that service was completed, which gives the Ontario proceeding solid proof that the defendant was properly notified.

This process exists to make service internationally reliable and legally recognized on both ends, but it also means it generally can't be rushed the way domestic service can, since it depends on a foreign government office's own procedures. Some member countries object to certain alternative methods the Convention otherwise permits, such as service by mail, so what's allowed can genuinely differ from country to country. Because the specific requirements depend on which country the defendant is in, it's worth confirming that country's particular rules and any reservations it has made under the Convention before starting the process.