Oussama Mellouli, Tunisian swimmer
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.

Since returning from an Adderall-related drugs ban, Oussama Mellouli has been the 1500 m freestyle World champion at the 2009 World Aquatics Championships with a winning time of 14:37.28, then the second-best performance of all time. Mellouli was the gold medalist in the 1500 freestyle at the 2008 Olympics, the bronze medalist in the 1500 freestyle at the 2012 Olympics, and the gold medalist in the 10 km marathon swim at the 2012 Olympics. He is the first Olympian to win medals in both the open water and the pool in a single Olympics.