- Norbert Rillieux
- Norman
- Norman (Civ5)
- Norman (Civ5)/Civilopedia
- Norman Knight (Civ5)
- Norman Knight (Civ5)/Civilopedia
- Norse Saga (Civ3)
- Norse Saga (Civ3)/Civilopedia
- Norse Tradition (Civ3)
- Norse Tradition (Civ3)/Civilopedia
- North America
- North Sea Alliance (CivBE)
- Norwegian
- Norwegian (Civ3)
- Norwegian (Civ3)/Civilopedia
- Norwegian (Civ5)
- Norwegian (Civ5)/Civilopedia
- Norwegian (Civ6)
- Norwegian (Civ6)/Civilopedia
- Norwegian (Civ6)/Vikings, Traders, and Raiders!
- Norwegian Ski Infantry (Civ5)
- Norwegian Ski Infantry (Civ5)/Civilopedia
- Norwegian cities
- Norwegian cities (Civ3)
- Norwegian cities (Civ6)
- Norwegian cities (Civ6)/Vikings, Traders, and Raiders!
- Notre Dame
- Notre Dame (Civ3)
- Notre Dame (Civ3)/Civilopedia
- Notre Dame (Civ4)
- Notre Dame (Civ4)/Civilopedia
- Notre Dame (Civ5)
- Notre Dame (Civ5)/Civilopedia
- Nubia Civilization & Scenario Pack (Civ6)
- Nubian
- Nubian (CTP2)
- Nubian (Civ6)
- Nubian (Civ6)/Civilopedia
- Nubian Pyramid (Civ6)
- Nubian Pyramid (Civ6)/Civilopedia
- Nubian cities
- Nubian cities (CTP2)
- Nubian cities (Civ6)
- Nuclear (Civ1)
- Nuclear Detente (CTP2)
- Nuclear Espionage (Civ6)
- Nuclear Espionage (Civ6)/Civilopedia
- Nuclear Fission
- Nuclear Fission (Civ1)
- Nuclear Fission (Civ2)
- Nuclear Fission (Civ5)
- Nuclear Fission (Civ5)/Civilopedia
- Nuclear Fission (Civ6)
- Nuclear Fission (Civ6)/Civilopedia
- Nuclear Fusion
- Nuclear Fusion (Civ5)
- Nuclear Fusion (Civ5)/Civilopedia
- Nuclear Fusion (Civ6)
- Nuclear Fusion (Civ6)/Civilopedia
- Nuclear Missile
- Nuclear Missile (Civ5)
- Nuclear Missile (Civ5)/Civilopedia
- Nuclear Msl. (Civ2)
- Nuclear Plant
- Nuclear Plant (CTP1)
- Nuclear Plant (CTP2)
- Nuclear Plant (Civ1)
- Nuclear Plant (Civ2)
- Nuclear Plant (Civ3)
- Nuclear Plant (Civ3)/Civilopedia
- Nuclear Plant (Civ4)
- Nuclear Plant (Civ4)/Civilopedia
- Nuclear Plant (Civ5)
- Nuclear Plant (Civ5)/Civilopedia
- Nuclear Power
- Nuclear Power (C-evo)
- Nuclear Power (CTP2)
- Nuclear Power (Civ1)
- Nuclear Power (Civ2)
- Nuclear Power (Civ3)
- Nuclear Power (Civ3)/Civilopedia
- Nuclear Power (CivRev)
- Nuclear Power (CivRev2)
- Nuclear Power Plant (Civ6)
- Nuclear Power Plant (Civ6)/Civilopedia
- Nuclear Power Plant (CivRev2)
- Nuclear Program (Civ6)
- Nuclear Program (Civ6)/Civilopedia
- Nuclear Submarine
- Nuclear Submarine (CTP2)
- Nuclear Submarine (Civ3)
- Nuclear Submarine (Civ3)/Civilopedia
- Nuclear Submarine (Civ5)
- Nuclear Submarine (Civ5)/Civilopedia
- Nuclear Submarine (Civ6)
- Nuclear Submarine (Civ6)/Civilopedia
- Nuclear accident (Civ6)
- Nuclear weapons
- Nuclear weapons (Civ4)
- Nuclear weapons (Civ5)
- Nuclear weapons (Civ6)
- Nuke (CTP1)
- Nuke (CTP2)
- Numantia
- Numidian
- Numidian Cavalry (Civ4)
- Numidian Cavalry (Civ4)/Civilopedia
- Numidian Mercenary (Civ3)
- Numidian Mercenary (Civ3)/Civilopedia
- Nurhaci
- Nurhaci (Civ5)
- Nurhaci (Civ5)/Civilopedia
- Nutmeg (Civ5)
- Nutmeg (Civ5)/Civilopedia
- Nutrients (SMAC)
- Nutrition Facility (Civ4)/Final Frontier
- Nzinga
- Nzinga (Civ6)
- Nzinga Mbande
- Nzinga Mbande (Civ6)
- Nzinga Mbande (Civ6)/Civilopedia
- O No Yasumaro (Civ6)
- O No Yasumaro (Civ6)/Civilopedia
- Oak
- Oak (CivRev)
- Oak (CivRev2)
- Oasis
- Oasis (C-evo)
- Oasis (Civ1)
- Oasis (Civ2)
- Oasis (Civ3)
- Oasis (Civ3)/Civilopedia
- Oasis (Civ5)
- Oasis (Civ5)/Civilopedia
- Oasis (Civ6)
- Oasis (Civ6)/Civilopedia
- Oasis (Col)
- Obelisk
- Obelisk (CTP2)
- Obelisk (Civ4)
- Obelisk (Civ4)/Civilopedia
- Obelisk (Civ6)
- Obelisk (Civ6)/Civilopedia
- Observation (Civ6)
- Observation (Civ6)/Civilopedia
- Observation Balloon (Civ6)
- Observation Balloon (Civ6)/Civilopedia
- Observatory
- Observatory (Civ4)
- Observatory (Civ4)/Civilopedia
- Observatory (Civ5)
- Observatory (Civ5)/Civilopedia
- Observatory (Civ6)
- Observatory (Civ6)/Civilopedia
- Observatory (CivBE)
- Obsolete
- Occult Research (Civ6)
- Occupation
- Occupation (Civ5)
- Ocean
- Ocean (CTP2)
- Ocean (Civ1)
- Ocean (Civ2)
- Ocean (Civ3)
- Ocean (Civ3)/Civilopedia
- Ocean (Civ4Col)
- Ocean (Civ5)
- Ocean (Civ5)/Civilopedia
- Ocean (Civ6)
- Ocean (Civ6)/Civilopedia
- Ocean (CivBE)
- Ocean (Col)
- Ocean (Freeciv)
- Ocean Faring
- Ocean Faring (CTP1)
- Ocean Faring (CTP2)
- Oceania
- Oconostota (Civ4Col)
- October 2014 patch (Civ5)
- Oda Nobunaga
- Oda Nobunaga (Civ5)
- Oda Nobunaga (Civ5)/Civilopedia
- Oda Nobunaga (CivRev2Plus)
- Odense
- Odeon (Civ4)
- Odeon (Civ4)/Civilopedia
- Odin (Civ6)
- Oedo year
- Offer (CTP2)
- Offshore Oil Rig (Civ6)
- Offshore Oil Rig (Civ6)/Civilopedia
- Offshore Platform
- Offshore Platform (C-evo)
- Offshore Platform (Civ2)
- Offshore Platform (Civ3)
- Offshore Platform (Civ3)/Civilopedia
- Offshore Platform (Civ4)
- Offshore Platform (Civ5)
- Offshore Platform (Civ5)/Civilopedia
- Offshore Wind Farm (Civ6)
- Offshore Wind Farm (Civ6)/Civilopedia
- Offworld Mission (Civ6)
- Offworld Mission (Civ6)/Civilopedia
- Oghuz
- Oil
- Oil (C-evo)
- Oil (CTP1)
- Oil (CTP2)
- Oil (Civ1)
- Oil (Civ2)
- Oil (Civ3)
- Oil (Civ3)/Civilopedia
- Oil (Civ4)
- Oil (Civ4)/Civilopedia
- Oil (Civ5)
- Oil (Civ5)/Civilopedia
- Oil (Civ6)
- Oil (Civ6)/Civilopedia
- Oil (CivRev)
- Oil (CivRev2)
- Oil Power Plant (Civ6)
- Oil Power Plant (Civ6)/Civilopedia
- Oil Refinery
- Oil Refinery (CTP1)
- Oil Refinery (CTP2)
- Oil Refining
- Oil Refining (CTP1)
- Oil Refining (CTP2)
- Oil Well
- Oil Well (Civ5)
- Oil Well (Civ5)/Civilopedia
- Oil Well (Civ6)
- Oil Well (Civ6)/Civilopedia
- Okihtcitaw (Civ6)
- Okihtcitaw (Civ6)/Civilopedia
- Olaf Tryggvason (Civ6)
- Olaf Tryggvason (Civ6)/Civilopedia
- Old Earth Relic (CivBE)
- Old Earth Relics (CivBE)
- Old Earth Relics (CivBE)/gallery
- Old Faithful (Civ5)
- Old Faithful (Civ5)/Civilopedia
- Old God Obelisk (Civ6)
- Old God Obelisk (Civ6)/Civilopedia
- Old Voice Archives (CivBE)
- Old World European (Civ5)
- Oligarchy
- Oligarchy (Civ3)
- Oligarchy (Civ3)/Civilopedia
- Oligarchy (Civ5)
- Oligarchy (Civ5)/Civilopedia
- Oligarchy (Civ6)
- Oligarchy (Civ6)/Civilopedia
- Oligarchy (advance) (Civ3)/Mesopotamia
- Oligarchy (advance) (Civ3)/The Rise of Rome
- Oligarchy (government) (Civ3)/Mesopotamia
- Oligarchy (government) (Civ3)/The Rise of Rome
- Olive Oil (Civ3)
- Olive Oil (Civ3)/Fall of Rome
- Olive Oil (Civ3)/The Rise of Rome
- Olive Oil (Civ3)/The Rise of Rome/Civilopedia
- Oliver Cromwell
- Olives
- Olives (Civ6)
- Olives (Civ6)/Civilopedia
- Olof Skötkonung (Civ6)
- Olof Skötkonung (Civ6)/Civilopedia
- Olympias
- Omar Alexis Ramos
- Omar Khayyam
- Omar Khayyam (Civ6)
- Omar Khayyam (Civ6)/Civilopedia
- Omen (Civ4)
- On (Civ6)
- On (Civ6)/Civilopedia
- Online Communities (Civ6)
- Online Communities (Civ6)/Civilopedia
- Onondaga
- Onur Aydemir
- Open-Air Museum (Civ6)
- Open-Air Museum (Civ6)/Civilopedia
- Open Borders
- Open Borders (Civ4)
- Opera House (Civ5)
- Opera House (Civ5)/Civilopedia
- Opera and Ballet (Civ6)
- Opera and Ballet (Civ6)/Civilopedia
- Operation Ivy (Civ6)
- Oppidum (Civ6)
- Oppidum (Civ6)/Civilopedia
- Optical Computers (SMAC)
- Optical Surgery (CivBE)
- Optics
- Optics (CTP1)
- Optics (CTP2)
- Optics (Civ4)
- Optics (Civ4)/Civilopedia
- Optics (Civ5)
- Optics (Civ5)/Civilopedia
- Optimization Imperative (Civ6)
- Optimization Imperative (Civ6)/Civilopedia
- Oracle
- Oracle (C-evo)
- Oracle (Civ1)
- Oracle (Civ2)
- Oracle (Civ4)
- Oracle (Civ4)/Civilopedia
- Oracle (Civ5)
- Oracle (Civ5)/Civilopedia
- Oracle (Civ6)
- Oracle (Civ6)/Civilopedia
- Oracle of Delphi (CivRev)
- Oracle of Delphi (CivRev2)
- Oracle of Delphi (CivWorld)
- Oral Tradition
- Oral Tradition (Civ6)
- Orator (Civ6)
- Orator (Civ6)/Civilopedia
- Orbital Automation (CivBE)
- Orbital Defense Pod (SMAC)
- Orbital Engineering (Civ4)/Final Frontier
- Orbital Engineering (Civ4)/Final Frontier/Civilopedia
- Orbital Fabricator (CivBE)
- Orbital Laboratory (CTP2)
- Orbital Laser (CivBE)
- Orbital Networks (CivBE)
- Orbital Power Transmitter (SMAC)
- Orbital Spaceflight (SMAC)
- Orbitals (CivBE)
- Order (Civ5)
- Order (Civ5)/Civilopedia
- Ordu (Civ6)
- Ordu (Civ6)/Civilopedia
- Ore
- Ore (Civ4Col)
- Ore (Col)
- Ore deposit (Col)
- Organ Printer (CivBE)
- Organic Superlubricant (SMAC)
- Organics (CivBE)
- Organized (Civ4)
- Organized Religion
- Organized Religion (Civ4)
- Organized Religion (Civ4)/Civilopedia
- Organized Religion (Civ5)
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