Jonathan Lee "Jon" Siebels (born August 27, 1979) is an American musician, best known as the guitarist of the band Eve 6. He became a part of the band after meeting bassist and lead vocalist Max Collins during Siebels' freshman year in Crescenta Valley High School.
Siebels was part of a band called Monsters Are Waiting, which played shows in the Los Angeles area before Siebels and another band member left the group.
In 2010, he performed on and co-wrote Hesta Prynn's solo debut EP Can We Go Wrong.
As of March 13, 2011, Siebels was welcomed back to Eve 6 on their official Facebook page.
Siebels is a candidate member of the Party for Socialism and Liberation.