Russell Allen is an American singer best known as the vocalist of the progressive metal band Symphony X. He has also worked with the supergroups Star One, Allen-Lande, Adrenaline Mob, Level 10, and as one of fourteen vocalists in the progressive symphonic metal band Trans-Siberian Orchestra.

Symphony X is an American progressive metal band from Middletown, New Jersey. Founded in 1994, the band consists of guitarist Michael Romeo, keyboardist Michael Pinnella, drummer Jason Rullo, lead vocalist Russell Allen and bassist Michael LePond.