Bonded by Blood is the debut studio album by the Bay Area thrash metal band Exodus. Although the album was completed in the summer of 1984, it was not released until 1985 due to issues with Exodus and their record label. It is considered one of the most influential thrash metal albums of all time. It is also the only full-length studio album of Exodus to feature Paul Baloff on vocals, though he was also on their 1982 Demo. Baloff was back in Exodus for five years (from 1997 to his death in 2002), and appeared on their 1997 live album Another Lesson in Violence.
In 2008, Exodus re-recorded Bonded by Blood and re-released it as Let There Be Blood, featuring a new line-up of members aside from drummer Tom Hunting and guitarist Gary Holt who played on the original.