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, home to a Izanagi terraforming base
 * Avalon
 * Charon
 * Dawn
 * Daedalus
 * Elysium, home to an Axon research station
 * Gaigan, a gas giant
 * Hell or 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 or Elara V, uninhabited jungle world, home to a Liandri mining facility
 * Santan's Furnace
 * Severnaya
 * Sulferon, desert world
 * Taiko
 * Vistula

Unreal Tournament

 * Earth, third planet from the Sun, home world of the Humans (multiple maps)
 * Kryllia (DOM-MetalDream)
 * Mars
 * Phobos, one of Mars's moons (DM-Phobos)
 * Skrath, Skaarj planet
 * Coret (CTF-Coret, DM Zeto)
 * Vandaron 3 (CTF-Dreary)
 * Vesuvius 9 (CTF-Hydro)
 * Zeus 6 (AS-Mazon)

UC, UT2003, and UT2004

 * Acatana
 * Alleria or JX-237, ice planet, home of the Juggernauts
 * Unknown planet
 * Anubis or ME-334, hot desert moon, home to the Anubans
 * Arborea or JX-4230, tropical forest planet, home to the Gen Mo'Kai (DM-TokaraForest, DOM-Renascent, DOM-SepukkuGorge)
 * Briggan IV, slave trafficking world)
 * Calaban VII (DM-Goliath)
 * Dawn (ONS-Dawn)
 * Earth, third planet from the Sun, home world of the Humans (multiple maps)
 * Kaldor Prime II
 * Lamdon 3 (AS-Glacier)
 * LBX-7683 (AS-RobotFactory)
 * Luxor IV
 * Na Pali (ONS-Dria)
 * Premaka or VX-739, space station, home of the Automatons
 * Purgatory / Abaddon or MX-2389, lava planet, home of the Nightmare
 * Red Planet (ONS-RedPlanet)
 * Sanctuary, rock planet, home of the Mercenaries
 * Taron, hot desert planet (AS-Convoy)
 * Vulcana 32

Unreal Championship 2

 * Asteroid 35332-XA, Lauren's place of death
 * Deneb IV, Brock's place of death
 * Nakhti Home world, home of the Nakhti

Unreal Tournament 3

 * Omicron 6, home planet of the Necris
 * Taryd, planet rich with tarydium