How do you say I'm sorry in french?

Literally, je suis désolé(e). - sounds like: zhuh swee day-zuh-LAY

You might also say excusez-moi (ex-kew-zay-MWAH) or excuse-moi (ex-kewz-MWAH), which has a much more apologetic meaning than "excuse me" in English. Je suis désolé(e), or just 'désolé(e)'. less formally, 'Pardonnez-moi', more formally, 'Je vous demande pardon'.