John Robert Moyer (born November 30, 1973) is an American musician, best known as the bassist for the heavy metal band Disturbed.

He is the owner and teaches at Natural Ear Music in Austin, Texas, where he works with a lot of young bands.

In April 2013, Moyer was announced to be filling in for Rudy Sarzo on bass for five tour dates in Geoff Tate's lineup formed after his dismissal from Queensrÿche.

[2] In January 2015, Moyer originally formed the band with Scott Weiland, Ron "Bumblefoot" Thal, twins Jon and Vince Votta entitled Art of Anarchy, and released their debut self-titled album in 2015 shortly before Scott Weiland's death in December 2015.

He also has custom amps with Kustom featuring his own design printed on the front resembling a skull engulfed in flames.