John Moyer (born November 30, 1973) is an American musician mainly known as the current bassist and back-up vocalist for the heavy metal band Disturbed. Taking over in 2004 after Steve "Fuzz" Kmak was fired, Moyer has played bass with the group since their third studio album, Ten Thousand Fists. In February 2012, Moyer joined Adrenaline Mob as the group's new bassist.