Wizardry IV: The Return of Werdna (originally known as Wizardry: The Return of Werdna - The Fourth Scenario) is the fourth scenario in the Wizardry series of role-playing video games. It was published in 1987 by Sir-Tech Software, Inc.

The Return of Werdna is drastically different from the trilogy that precedes it. Rather than continuing the adventures of the player's party from the previous three games, The Return of Werdna's protagonist is Werdna, the evil wizard that was defeated in the end of Wizardry: Proving Grounds of the Mad Overlord and imprisoned at the bottom of his dungeon forever.