Rex Buckland (portrayed by Neil Roberts) is a character from the TV series Charmed, first appearing in the Season One episode "I've Got You Under My Skin".
He was the identity used by a warlock whose mission was to destroy the Charmed Ones. It was the name of the successful owner of Buckland Auction House. He was murdered along with his coworker Hannah Webster by two warlocks who assumed their identities. The warlock Rex was sent by the Source of All Evil to confirm the true existence of the alleged Charmed Ones. To do this, Rex hired the eldest sister, Prue Halliwell. Rex and Hannah kept watch over Prue for many months. Rex had the powers of astral projection and suggestion, both of which he would use to plant thoughts in others' minds to convince them to think or say a certain thing.
During their time at Buckland, Rex and Hannah help Hecate in her marriage scheme, are nearly victims of Prue's truth spell, and unleash the evil warlock Matthew Tate on the sisters. They finally made their attack in the episode "Wicca Envy" by framing Prue for theft and later murder. The warlocks forced the sisters to surrender their powers before Leo intervenes, causing them to be vanquished.