Jon Philip Theodore (born December 30, 1973) is an American drummer. He is best known as a former member of The Mars Volta and as the current drummer for Queens of the Stone Age. Theodore is also a member of One Day as a Lion.
Known for his explosive, multi-textural playing style, Theodore was a member of both Golden and Royal Trux before joining The Mars Volta in 2001. Theodore remained within the band for five years, recording the band's first three studio albums, De-Loused in the Comatorium (2003), Frances the Mute (2005) and Amputechture (2006), before departing at the request of guitarist and bandleader Omar Rodríguez-López.
Theodore subsequently formed a collaboration with Rage Against the Machine vocalist Zack de la Rocha, entitled One Day as a Lion, and performed on Incubus frontman Brandon Boyd's solo album, The Wild Trapeze (2010). In 2012, Theodore replaced his Mars Volta successor Thomas Pridgen in the supergroup Giraffe Tongue Orchestra, though by 2015 the lineup had reverted to Pridgen on drums.
In 2013, Theodore joined Queens of the Stone Age, replacing Joey Castillo, who left the band citing burnout from constant touring. Although Dave Grohl recorded the drums on Queens of the Stone Age's sixth studio album ...Like Clockwork (2013), Theodore accompanied them on the subsequent tour and has since become a full-time member.