A wizard was a type of person from the mythology of old Earth's history who commanded great magic, although the term was also used to refer to real persons who possessed great knowledge. (TOS novel: The Rift)
Other titles for those who used magic were sorcerer, magician, witch and warlock.
In 2264, Chang created the illusion of a genie to grab a nacelle of the USS Enterprise and force a landing party to visit him. He threatened to destroy the ship unless they agreed to obtain for him the Sceptre of the Sun, a magic artifact. (TOS comic: "Sceptre of the Sun")
In 2266, the wizardly Great Vrunon appeared as a giant head through a glass cube within the Shrine at Dafu on the planet Jodarr in 2266, thanks to holography. It was a persona through which the non-corporeal Vrunon advised Ledoy, allowing him to unite the population of the medieval world. Vrunon had a reputation of being able to turn iron into gold. (TOS comic: "Spore of the Devil")
In 2268, the USS Enterprise encountered the wizard Klee and his barbarian associate Konrac, who were trying to divert a living temporal distortion away from their planet. Seemingly through the use of magic, Klee propelled his spacecraft and provided Konrac with superhuman strength. (TOS audiobook: The Time Stealer)
In 2269, the immortal human Flint said he had once been Merlin, a legendary wizard in Terran stories who served as advisor to King Arthur of Ancient Britain. Merlin was thought to be a wizard with preternatural knowledge of the future. (TOS episode & Star Trek 5 novelization: Requiem for Methuselah, TNG comic: "... Where No One Has Gone Before!")
In 2269, the USS Enterprise visited Megas-Tu in a pocket universe in the center of the Milky Way Galaxy. Megans such as Asmodeus and Lucien manipulated reality in ways that looked like magic. They had once visited Salem, Massachusetts on Earth. (TAS episode & novelization: The Magicks of Megas-Tu)
In 2376, the knight Koros was mortally wounded while fighting a dragon-like creature. He died shortly after a wizard that called himself The Doctor arrived and stunned the dragon. (VOY comic: "Avalon Rising")
- The Doctor
- Merlin (Flint)
- Roald the Invisible
- The Wizard
- TAS episode: "The Magicks of Megas-Tu"
- TOS comic: "Sceptre of the Sun"
- TOS comic: "Spore of the Devil"
- TOS audiobook: The Time Stealer
- TOS novel: World Without End
- VOY comic: "Avalon Rising"
- TOS episode & Star Trek 5 novelization: Requiem for Methuselah
- TOS comic: "The Legacy of Lazarus"
- TOS - The New Voyages short story: "The Enchanted Pool"
- TOS novel: Strangers from the Sky
- TOS novel: The Rift
- TOS - The Eugenics Wars novel: The Rise and Fall of Khan Noonien Singh, Volume 2
- TOS - Vulcan's Soul novel: Epiphany
- TOS - SA novel: Starfleet Academy
- TOS novel: Excelsior: Forged in Fire
- TNG novel: The Peacekeepers
- TNG comic: "... Where No One Has Gone Before!"