'''Koei Co., Ltd.''' 『株式会社コーエー』 is a video game company best known for its historically-based (and [[VeryLooselyBasedOnATrueStory loosely-based]]) video games, especially those set in feudal China or Japan. They made their name in Japan with TurnBasedStrategy games such as ''VideoGame/NobunagasAmbition'', but outside Japan by far the most successful of their games is the ''[[Franchise/DynastyWarriors Warriors]]'' (''Musou'') franchise of HackAndSlash games (which includes ''VideoGame/DynastyWarriors'', ''VideoGame/SamuraiWarriors'' and the crossover ''VideoGame/WarriorsOrochi'').

The company also distributes games from Creator/NipponIchi's catalog in North America and Europe. In 2010, Koei merged with Creator/{{Tecmo}}, and the resulting parent company became known as '''Tecmo Koei Corporation'''. Its name was changed again to ''Koei Tecmo Corporation'' in July 2014 to be more in line with its "KT" logo, similarly to Bandai Namco changing its name from Namco Bandai Games Inc. the same year.

Music/YokoKanno worked for Koei in the late 80s and early 90s, composing scores for many of their games.

!!Games created/developed by Koei:
* ''VideoGame/BladeStormTheHundredYearsWar''
* ''Crimson Sea''
* ''VideoGame/DragonQuestHeroesTheWorldTreesWoeAndTheBlightBelow''[[superscript:5]]
* ''VideoGame/DynastyWarriors''
* ''VideoGame/DynastyWarriorsGundam''
* ''VideoGame/FistOfTheNorthStarKensRage''[[superscript:1]]
* ''VideoGame/HyruleWarriors''[[superscript:1, 2]]
* ''Mystic Heroes''
* ''VideoGame/OnePiecePirateWarriors''[[superscript:1,2,3]]
* ''VideoGame/SamuraiWarriors''
* ''VideoGame/WarriorsOrochi''
* ''VideoGame/WarriorsLegendsOfTroy''

* ''Bandit Kings of Ancient China''
* ''VideoGame/CelticTales: Balor of the Evil Eye''
* ''L'Empereur''
* ''Gemfire'' (known as ''Royal Blood'' in Japan)
* ''Genghis Khan''
* ''VideoGame/NobunagasAmbition''
** ''VideoGame/PokemonConquest'' ({{Crossover}} between ''VideoGame/NobunagasAmbition'' and ''Franchise/{{Pokemon}}'')[[superscript:1, 2]]
* ''VideoGame/RomanceOfTheThreeKingdoms''
* ''Taikou Risshiden''

[[AC:Other Games]]
* ''VideoGame/{{Aerobiz}}'' (airline franchise sim)
* ''Franchise/{{Angelique}}'' (dating/simulation sim)
* ''Franchise/{{Atelier}}'' series[[superscript:1, 4]]
** ''VideoGame/AtelierAyeshaTheAlchemistOfDusk''
** ''[[VideoGame/AtelierTotoriTheAdventurerOfArland Atelier Totori Plus ~The Adventurer of Arland~]]''
** ''[[VideoGame/AtelierMeruruTheApprenticeOfArland Atelier Meruru Plus ~The Apprentice of Arland~]]''
** ''VideoGame/AtelierEschaAndLogyAlchemistsOfTheDuskSky''
** ''[[VideoGame/AtelierRoronaTheAlchemistOfArland Atelier Rorona Plus ~The Alchemist of Arland~]]''
** ''VideoGame/AtelierShallieAlchemistsOfTheDuskSea''
* ''VideoGame/DeStrega'' (magic-based fighting game)
* ''VideoGame/GitarooMan'' (rhythm game)
* ''VideoGame/HarukanaruTokiNoNakaDe ''(dating/simulation sim)
* ''VideoGame/{{Inindo}}: Way of the Ninja'' (RPG)
* ''VideoGame/{{Kessen}}'' (real-time strategy)
** ''VideoGame/KessenII''
** ''VideoGame/KessenIII''
* ''VideoGame/KiniroNoCorda'' (dating/simulation sim)
* ''VideoGame/MonsterRacers''
* ''VideoGame/NavalOps'' (naval warfare sim)
** ''Naval Ops: Commander''
** ''Warship Gunner 2''
* Nioh: An action RPG famous for being based on an unfinished script by none other than Creator/AkiraKurosawa and for its long cycle of DevelopmentHell, first being shown in 2005 and with its current release slated for 2016
* ''VideoGame/{{Opoona}}'' (RPG)
* ''P.T.O.'' (naval warfare sim)
* ''VideoGame/SaiyukiJourneyWest'' (turn-based tactical RPG)
* ''VideoGame/{{Toukiden}}''[[superscript:1]] (action RPG in the veins of ''Monster Hunter'' or ''Gods Eater'')
* ''[[VideoGame/TrinitySoulsOfZillOll Trinity: Souls of Zill O'll]]''[[superscript:1]] (RPG)
* ''VideoGame/UnchartedWaters'' (sea exploration sim)
** ''VideoGame/UnchartedWatersNewHorizons''
** ''VideoGame/DaikoukaiJidaiIVPortoEstado''
** ''VideoGame/UnchartedWatersOnline''
* ''[=WinBack=]'' (third-person shooter)
[[superscript:1]] - published or developed as Tecmo Koei/Koei Tecmo Games\\
[[superscript:2]] - developer; published by Creator/{{Nintendo}}\\
[[superscript:3]] - developer; published by Bandai Namco Games\\
[[superscript:4]] - publisher; developed by Gust Co., Ltd.\\
[[superscript:5]] - developer; published by Creator/SquareEnix