Oussama "Ous" Mellouli (Arabic: أسامة الملولي; born 16 February 1984) is a Tunisian swimmer who competes in the freestyle and medley events. He is a three-time Olympic medalist, is an African record holder, and trains with the USC Trojans team based at the University of Southern California, where he studied as a computer science undergraduate and swam collegiately.