Pleroma (from the Koine Greek word meaning "fullness") is the transcendent celestial realm of pure light and divine totality. It stands as the complete spiritual opposite to the material world, which Gnostics view as a flawed, empty void or restriction (the kenoma or hysterema).

At the absolute center or origin of the Pleroma is the Monad, the unnameable, invisible, and infinite Father.

In Gnostic texts (such as those from the Nag Hammadi library) and accounts by early church fathers like Irenaeus, Jesus and Sophia are described as a divine pair—the bride and bridegroom whose spiritual union restores completeness (the Pleroma).