Bill Kelliher is the rhythm guitarist of the Atlanta heavy metal band Mastodon.

Bill's uses 3 guitars in Mastodon: A Gibson Les Paul Custom in a Silverburst finish a Gibson Explorer in black, and a custom Yamaha SGB. Bill used Laney amplification at one time(specifically, the VH100R head)but now plays a Marshall JCM 800 single channel reissue , and has an Ibanez Tube King, a Boss TU-2 Tuner, and a MXR M-135 Smart Noise Gate in his effects chain. A Digitech Jamman Looper Pedal is used to trigger various samples that are separate from the guitar. Like Brent, Bill also utilizes three tunings in Mastodon: D Standard (E Standard down one whole step, D G C F A D), Drop C (Drop D down one whole step, C G C F A D), and another tuning similar to Drop C, but with the low E tuned down to A (A G C F A D).

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