Christology: A Biblical, Historical, and Systematic Study of Jesus is a 2009 theological book by the Australian Jesuit priest and academic Gerald O'Collins. This work was originally published in 1995 with the title Christology: A Biblical, Historical, and Systematic Study of Jesus Christ, but the author thoroughly revised the whole text in 2009 to take account of the numerous biblical, historical, and systematic studies of Jesus that appeared following its first edition.

In this revised and updated second edition of his account of systematic Christology, O'Collins critically examines the more authoritative biblical and historical scholarship before confronting some key questions about orthodox faith and free will as applicable to Jesus in his person, being, and activity. In seeking to clarify the essential truths about him, the book investigates who Jesus was/is and what he did/does.