The War Arc is a StoryArc that concerns two or more large-scale factions (city-sized at least) in conflict with one another, with the protagonists being involved somehow. The scale will usually be very epic, with politics usually playing a role. Expect to see a BigBadassBattleSequence.

See also RescueArc and TournamentArc.
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!!Examples:

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[[folder:Anime and Manga]]
* The Whitebeard War saga in ''OnePiece'', especially the Marineford arc, where dozens of incredibly powerful characters from throughout the series clash in a massive conflict between pirates and the government. Interestingly, this one doubles as a RescueArc, as the pirates storm marine headquarters to save their comrade [[spoiler: Ace]] from a public execution.\\
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It's also unusual among both war and rescue arcs for a couple of big reasons: almost none of the main cast are present (the protagonist is there, but none of his TrueCompanions) the hero is actually one of the weaker people on the battlefield, and [[spoiler: the antagonists win the war. The rescue also fails, with the character they're trying to rescue getting killed.]]
** Since most arcs in One Piece involve the Straw Hats arriving at a new location and getting involved in local conflicts between various factions, war arcs are actually pretty common. Notable examples include Alabasta and Skypiea.
** Not to mention The Enies Lobby Arc, where the Straw Hats declare war on the ''entire world government'' to [[TrueCompanions save a member of their crew]].
* The Shinobi World War Arc in ''{{Naruto}}'' is the most recent example, but it had the Konoha Invasion arc several hundred chapters earlier, which tied in with the Chuunin Exams TournamentArc [[spoiler:and actually cut that one short.]]
* ''Manga/{{Bleach}}'':
** Ostensibly, the "Winter War" between the Gotei 13 and the Arrancar led by Sosuke Aizen. It was less of a War Arc than a RescueArc ramped UpToEleven, with a BigBadassBattleSequence for the remaining antagonists at the end of the Arc.
** The final manga arc is the culmination of 1,000 years of intermittent warfare between the Shinigami and the Vandenreich. The Blood War has been characterised by massacres: there was one a thousand years ago, another one two hundred years ago, and another one begins in the final arc, which includes major deaths [[spoiler:RIP Yamamoto]].
* The ongoing conflict between the Exorcists of the Black Order and the Millennium Earl's Akuma make up a good portion of the MythArc for ''DGrayMan''.
* The Arachnophobia arc and the Moon arc in ''SoulEater''.
* The war between the Kingdom of Midland and the Tudor Empire is the second plot of the Golden Age Arc in ''{{Berserk}}.''
** The Hawk of the Millennium Empire arc focuses on one between Midland (and the Apostle army led by the reincarnated Griffith) and the Empire of Kushan led by the rogue Apostle Emperor Ganishka.
* ''LightNovel/ACertainMagicalIndex'' has the British Civil War arc, and shortly thereafter, the ''WorldWarThree'' arc, the latter of which makes for the climax of the original series of light novels.
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[[folder:Comics]]
* The GreenLantern has the SinestroCorpsWar (Green Lantern Corps vs Sinestro Corps), War Of Light (7 different Corps against each other) and BlackestNight (everybody against Black Lantern Corps).
* ComicBook/ChaosWar is this for IncredibleHercules
* Cosmic Marvel has had multiple war arcs in last few years. ''ComicBook/{{Annihilation}}'' was a war between the Negative Zone and the normal universe, ''ComicBook/{{Annihilation}}: Conquest'' told the tale of the Phalanx's invasion of the Kree Empire, ''WarOfKings'' depicted the war between the Kree and Shi'Ar empires and ''TheThanosImperative'' was a war between the normal Universe and [[EldritchAbomination the Cancerverse]].
* ComicBook/CivilWar, which focuses on heroes taking different sides and fighting about whether or not to put themselves under government control and do away with secret identities.
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[[folder: Fan Fiction ]]
* ''Fanfic/TheVizardTrilogy'' revolved around the war between the titular Visoreds and the Shinigami.
* The ''FanFic/PonyPOVSeries'':
** The majority of the [[BadFuture Dark World Series]] is the Mane Six breaking free of [[EvilOverlord Discord's]] control and acting as LaResistance against his control of the world, having some epic battles against him and his many minions [[spoiler: as well as his [[TrueFinalBoss puppet master]], [[KnightTemplar Nightmare]] [[FutureMeScaresMe Eclipse]]]].
** The Shining Armor Arc grows into one of these between Equestria and its allies (represented by Cadence and Shining Armor's Harmony Guard) and the [[TheEmpire Hooviet Empire]] under the control of [[GeneralRipper General-Admiral Makarov]], ultimately culminating in BigBadassBattleSequence [[spoiler: and a CosmicRetcon]].
** The Wedding Arc becomes one of these as the vastly outnumbered Mane Six and their allies have to fight against the Changeling occupation of Canterlot.
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[[folder:Literature]]
* Books 21-25 (and beyond?) of the Literature/{{Gor}} series are focused on the war between the city-state of Ar and Cos, the island Ubarate. Tarl, our protagonist, is on the side of Ar; but Cos won the war...so far.
* MercedesLackey has The Mage War in her ''HeraldsOfValdemar'' books.
* Book 7 of Literature/HarryPotter has the war between Voldemort's Death Eaters and the wizards of Hogwarts.
* ''Literature/TheDresdenFiles'' has a massive MythArc about the SecretWar between Red Court vampires and the wizards' White Council, which breaks out in ''Grave Peril'' and comes to an abrupt end in ''Changes''.
* The ''Literature/NewJediOrder'' is a nineteen-book War Arc within the Franchise/StarWarsExpandedUniverse between the New Republic and the [[ScaryDogmaticAliens Yuuzhan Vong]].
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[[folder:Live Action TV]]
* ''Series/BabylonFive'' featured the Narn-Centauri war, the Shadow war, and the Earth Civil War.
* A few ''Franchise/StarTrek'' series mustered some of these into their runs.
** Season 3 of ''Series/StarTrekEnterprise'' has the eponymous Enterprise racing to stop the Xindi from launching an attack on Earth.
** ''[[Series/StarTrekDeepSpaceNine Deep Space Nine]]'' famously featured the two-year war between the Federation and the Dominion, but it also had the Klingon-Cardassian war and the second Klingon-Federation war (before both sides discovered they'd been played like cheap fiddles).
** The ''Series/StarTrekVoyager'' writers wanted to make "Year of Hell" a season-long arc, but the executives said no, and it was instead made into a two-parter.
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[[folder:VideoGames]]
* ''Franchise/MassEffect'' has the conflict with [[TheDragon Saren]] and the geth in the first game. Notable battles include Saren's attack on Eden Prime (the prologue), the geth besieging the human planet-colony of Feros, the brawl on Saren's headquarters at [[WhamEpisode Virmire]], a side-quest that has TheHero attacking several bases to prevent the geth from launching an invasion, and [[BigBadassBattleSequence the Battle of the Citadel]] as the finale.
** The second game, notably, avoids this from the main plotline, but the possibility of a second war between the geth and quarians is addressed several times. Additionally, the EnemyCivilWar between the TrueNeutral geth and the AlwaysChaoticEvil heretic geth is brought to light, but we never see the actual fighting take place, and we can end it for good during the SixthRanger's loyalty mission.
** In the Arrival DLC, [[BigGood Admiral Hackett]] outright states that war between the humans and batarians could erupt, following the destruction of a batarian-occupied system. Didn't turn out to be true, since the batarians were [[ButtMonkey unfortunate enough]] to be in the Reapers' way as they headed for Earth.
** VideoGame/MassEffect3 features the intergalactic war against the Reapers and their Husks, the conflict with a massively strengthened Cerberus, and the quarians retaking their homeworld from the geth, all going on ''at the same time''. The developers have repeatedly said that ''Mass Effect 3'' is the start of World War II IN SPACE!...
* {{Halo}} has the Human-Covenant war as its MythArc, with the Covenant Civil War as a late side-effect carrying over to the finale.
* A major plotline in ''VideoGame/TheElderScrollsVSkyrim'' is the conflict between the Imperial Legion and the Stormcloak rebellion led by Ulfric Stormcloak. The player is free to help the Empire quell the rebellion or the Stormcloaks fight off the Legion and have Skyrim become an independent nation.
* VideoGame/FalloutNewVegas centers around a war between the [[TheFederation New California Republic]] and [[TheHorde Caesar's Legion]], with [[TheChessmaster Mr. House]] serving as a potential third party. You're given the opportunity to support any three of those. That or decide to [[DarkhorseVictory oppose all three and rule Vegas yourself]].
* ''VideoGame/FinalFantasyIX'': From halfway through Disc One until the end of Disc Two is a long one, showing Brahne's bid for power - even going as far as [[SummonMagic stealing her daughter's powers]] to do it. She actually makes good progress on her goal of owning the entire Mist Continent - [[spoiler:[[HoistByHisOwnPetard too bad Kuja turns Bahamut back on her]]]].
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[[folder:Web Original]]
* ''Machinima/RedVsBlue'' has the "war" between the ''vastly'' incompetent or undesirable Reds and Blues, but we barely see any sort of firefights between them (Battle Creek flag zealots notwithstanding), and it's actually just a training scenario used by {{Super Soldier}}s; the last detail is kept secret from the Reds and Blues themselves.
* ''Literature/{{Worm}}'' has the Extermination arc where heroes and villains in the city join forces and are joined by heroes from elsewhere to fight off Leviathan. If it sounds uneven, it was: there are many casualties on the side of the heroes and villains but Leviathan will recover without a problem. Later, the Crushed arc covers the fight against Behemoth.
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[[folder:Webcomics]]
* ''Webcomic/TheOrderOfTheStick'' has the Battle for Azure City.
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[[folder:Western Animation]]
* ''WesternAnimation/AvatarTheLastAirbender'' is about stopping a war that's already going on, sort of making it a [[MythArc series-long]] War Arc.
** ''WesternAnimation/TheLegendOfKorra'' actually see the events leading up to one between the Equalists and the Benders.
* The WesternAnimation/TeenTitans spent the near-entirety of the fifth season battling the forces of the BrotherhoodOfEvil, ending just before the final episode.
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