Steve Di Giorgio is an American bass guitarist. He is known for his work with numerous heavy metal bands such as Sadus, Death, Testament, Megadeth, Sebastian Bach, Iced Earth, Autopsy, Obituary, Control Denied, Dragonlord and Charred Walls of the Damned, and he has performed on over 50 albums as a guest, session or full-time band musician.

Sadus is an American thrash metal band from Antioch, California, active from 1985[A] to 2015, and reunited in 2017. Originally a quartet, the band's sound fuses thrash metal with death metal, featuring highly technical musicianship. They are known for the unique death growl of vocalist Darren Travis, and bassist Steve Di Giorgio. During their career, Sadus has released six studio albums, one compilation album and four demos, and had two lineup changes, with the band continuing without replacing any of the departed members.