Atom Ellis (born April 8, 1966) is a bass guitarist from San Francisco, California.

Atom was a founding member of the Thrash Funk band Psychefunkapus from 1986 to 1992 and a member of the San Francisco band Dieselhed from 1993 to 2000.

During and after his tenure with Dieselhed he also performed as a regular sideman for Link Wray from 1996 to 2003.

For shorter stints Atom performed and recorded with World Entertainment War, The Pop-o-pies, Linda Perry, Virgil Shaw, Richard Thompson, Carl Hancock Rux, Neil Hamburger, Chuck Prophet, and Brittany Shane.

[1] Atom Ellis has more recently toured as bassist and backup vocalist for The New Cars.