Certificate of Due Diligence

Orange County Superior Court · Locally Approved Forms

Verified current as of July 16, 2026

This form is used to show that someone has made a good-faith effort to find and notify a defendant or other party in a legal case before proceeding. A person filing a lawsuit or legal action would need this form when they cannot locate a defendant to serve them with court papers and must prove to the judge that they tried hard to find that person.