''Nobunaga's Ambition'' is a strategy game series made by {{Koei}}, the first installment being released in 1983. The game puts you in the role of a ''daimyō'' in [[JidaiGeki Sengoku-era Japan]], your goal being to unify the country and earn (or with one clan, keep) the title of ''Shōgun''. As long as this series remains largely unchronicled in the West, the [[http://en.wikipedia.org/wiki/Nobunaga_no_Yabou article]] on {{Wikipedia}} has a brief history of the series you might find relevant. Thirteen main-series games have been released in Japan, scattered across [[MultiPlatform an army of platforms]].

A crossover game titled ''VideoGame/PokemonConquest'', featuring elements from ''Nobunaga[='s=] Ambition'' and ''{{Pokemon}}'', was released by Nintendo and Tecmo Koei on March 17th, 2012 in Japan. Fans went wild, especially from the ''Pokémon'' side of things possibly due to the DarkerAndEdgier crossover aspects.
This game series provides examples of:
* BadAss: Some of the generals qualify easily. Azai Nagamasa and Sanada Yukimura can easily shoot up the ranks when in cavalry units.
* CrossOver: ''Pokémon Conquest''. Standard NotMakingThisUpDisclaimer applies.
* GenderFlip: The latest title in the series has a female version of Uesugi Kenshin, based on a popular legend that tries to explain some aspects of his behavior and historical accounts
* MultiPlatform: This series has hit most of the popular consoles since the {{NES}}, a few that weren't, a bunch of (rarely mutually compatible) 1980s Japanese PC brands, and most iterations of Windows since the 1990s. Also a couple of ports for Macintosh, and one for Amiga.
* NameOrderConfusion: Like the ''VideoGame/SamuraiWarriors'' games, in English translations, it's written in first name-last name order despite this being in Sengoku era.
* NintendoHard: In the {{NES}} version, it's possible on higher difficulties to die before your first turn.
* SpinOff: The ''VideoGame/DynastyWarriors''-based ''SamuraiWarriors''. It may have been instrumental in getting a U.S. release for ''Rise to Power'' and ''Iron Triangle''.
* VideoGameCrueltyPotential: Just as in ''VideoGame/RomanceOfTheThreeKingdoms'', you can execute captured generals (or even your own retainers) on a whim.
* {{Video Game Long Runner|s}}: Fourteen main releases since 1983, not counting all the little differences between ports. Not so many as its sister series, but still respectable.