Mahrez Mebarek (Arabic: محرز مبارك; born February 11, 1985) is an Algerian former swimmer, who specialized in freestyle events.

Mebarek made his official debut at the 2004 Summer Olympics in Athens, where he qualified for two swimming events.

In the 400 m freestyle, he challenged seven other swimmers on the third heat, where South Korea's Park Tae-Hwan was disqualified for a false start.

[2][3] In his second event, 200 m freestyle, Mebarek shared a thirty-fifth place tie with Macedonia's Aleksandar Malenko in the preliminaries with a time of 1:53.00.

[6][7] He challenged six other swimmers on the second heat, including four-time Olympian Andrei Zaharov of Moldova.