Planets in the Unreal Universe

Unreal

 * Na Pali, aka "Gryphon #4-A", the 4th planet of the twin-star Gryphon system, rich with Tarydium, home of the Nali

Unreal 2

 * Acheron, mostly covered by a single organism, Izanagi terraforming base
 * Avalon
 * Charon
 * Dawn
 * Daedalus
 * Elysium, home to an Axon research station
 * Gaigan, a gas giant
 * Hell, aka "Eizo VI C", one of Gaigan's moons
 * Janus, a planet of cold steppes
 * Kalydon
 * Na Koja Abad, Arabic for "Land of Nowhere"
 * NC962
 * Odyssey IV, Home to TCA HQ
 * Quantico
 * Quintana
 * Sanctuary, aka Elara V, an uninhabited jungle world, home to a Liandri mining facility
 * Santan's Furnace
 * Severnaya
 * Sulferon, a dessert world
 * Taiko
 * Vistula

Unreal Tournament

 * Earth
 * Kryllia (DOM-MetalDream)
 * Mars
 * Skrath (Skaarj Planet)
 * Coret (CTF Coret, DM Zeto)
 * Phobos
 * Vandaron 3 (CTF-Dreary)
 * Vesuvius 9 (CTF Hydro)
 * Zeus 6 (AS-Mazon)

UC, UT2003, and UT2004

 * Alleria, ice planet, home of the Juggernauts
 * Acatana
 * Anubis, hot desert planet, home to the Anubans
 * Arborea, forest planet, home to the Gen Mo'Kai
 * Briggan IV (Slave trafficing world)
 * Calaban VII (DM-Goliath)
 * Dawn (ONS-Dawn)
 * Earth (multiple maps)
 * Kaldor Prime II
 * Lamdon 3 (AS-Glacier)
 * LBX-7683 (AS-RobotFactory)
 * Luxor IV
 * Na Pali (ONS-Dria)
 * Premaka, space station, home of the Automatons
 * Purgatory / Abaddon, lava planet, home of the Nightmares
 * Red Planet (ONS-RedPlanet)
 * Sanctuary, rock planet, home of the Mercenaries
 * Taron (AS-Convoy)
 * Vulcana 32

Unreal Championship 2

 * Asteroid 35332-XA (Lauren's Death place)
 * Deneb IV (Brock's Death Place)
 * Nakhti Homeworld, home of the Nakhti

Unreal Tournament 3

 * Taryd
 * Whisper