Serj Tankian (born August 21, 1967) is an Armenian-American singer-songwriter, composer, multi-instrumentalist, record producer, poet, and political activist. He is best known as the lead vocalist, songwriter, keyboardist, and occasional live rhythm guitarist of the rock band System of a Down. During his musical career, Tankian has released five albums with System of a Down, one with Arto Tunçboyacıyan (Serart), as well as three solo albums Elect the Dead, Imperfect Harmonies, and Harakiri. A live orchestral version of Elect the Dead incorporating the Auckland Philharmonia Orchestra named Elect the Dead Symphony was released. In 2002, Tankian and Rage Against the Machine/Audioslave guitarist Tom Morello co-founded a non-profit political activist organization, Axis of Justice.

Tankian also founded the music label Serjical Strike Records. On August 12, 2011, Tankian was awarded the Armenian Prime Minister's Medal for his contributions to the recognition of the Armenian Genocide and the advancement of music.