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 II

 * Acheron, mostly covered by a single organism, home to a Izanagi terraforming base
 * Odyssey IV (Avalon), home to TCA HQ
 * Charon
 * Dawn
 * Daedalus
 * Elysium, home to an Axon research station
 * Gaigan, a gas giant in the Eizo system
 * Hell or Eizo VI-C, one of Gaigan's moons
 * Janus, a planet of cold steppes, six thousand miles in diameter, orbiting the weak K-type star Asgar, home to secret TCA research lab
 * Kalydon, houses to Military Outpost Kilo Five Seven
 * Na Koja Abad, Arabic for "Land of Nowhere", has major Izanagi installation and dig site
 * NC962VII, Drakk homeworld
 * Quantico
 * Quintana
 * Sanctuary or Elara V, fifth planet in the Elara system, uninhabited jungle world, home to a Liandri mining facility Lima Six
 * Santan's Furnace
 * Severnaya, houses Minkovsky dam
 * Sulferon, desert world
 * Taiko, out-of-the-way planet with one moon, pivotal in the Strider Wars
 * Vistula

Unreal Tournament

 * Earth, third planet from the Sun, home world of the Humans (multiple maps)
 * Kryllia (DOM-MetalDream)
 * Mars, fourth planet from the Sun, also known as the Red Planet
 * Phobos, one of Mars's moons (DM-Phobos)
 * Skrath, Skaarj planet
 * Unknown planet
 * Coret, moon orbiting unknown planet (CTF-Coret, DM-Zeto)
 * Valkyrus, lush planet (DM-Agony)
 * Vandaron 3, said to be the wettest place in the galaxy due to the constant rain (CTF-Dreary)
 * Vesuvius 9 (CTF-Hydro16)
 * Zeus 6, jungle planet (AS-Mazon)

UC, UT2003, and UT2004

 * Acatana (AS-BP2-Acatana)
 * Alleria or JX-237, ice planet, home of the Juggernauts (DM-1on1-Crash, DM-Aqua_Mortis, DM-Oceanic)
 * 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 (CTF-OtarosRun, 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 (AS-FallenCity, AS-Mothership, DM-Gestalt, DM-Morpheus3, and likely others)
 * Kaldor Prime II
 * Lamdon 3 (AS-Glacier)
 * LBX-7683 (AS-RobotFactory)
 * Luxor IV, home to the Valley of Kings, an Anuban burial place and afterlife
 * Na Pali (ONS-Dria, DM-Rrajigar)
 * Premaka or VX-739, space station, home of the Automatons
 * Purgatory / Abaddon or MX-2389, lava planet, home of the Nightmare (DM-Inferno)
 * 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