* In ''Webcomic/DrowTales'', after a long and bloody war between the Sharen and Sarghress clans, who have long considered one another to be their ArchEnemy, Sabbror [[spoiler:agrees to turn over all Sharen holdings in exchange for the Sarghress clan's help in getting revenge against the traitors that condemned the Sharen to a FateWorseThanDeath]].
* ''Webcomic/SchlockMercenary'' Defies this with Maxim 29 from ''The Seventy Maxims of Maximally Effective Mercenaries'': "The enemy of my enemy is my enemy's enemy. No more. No less." but the actual trope does come into play at least once. True to the maxim, both sides will invariably race to put their knife in the others' back first.
* During the "Dangerous Days" arc of ''Webcomic/SluggyFreelance'', the gang's (first) trump card against Hereti Corp is [[spoiler:Oasis, who had kidnapped or tried to kill most of them in the past. Only her devotion to Torg and mind control programming kept her somewhat on their side]].
** Also, due to his SociopathicHero nature, almost any time Bun-Bun is persuaded to help the other characters has shades of this.
* In ''Webcomic/TowerOfGod'', after a MeleeATrois between Viole, Arkraptor and Kang Horyang seemed to have no end, Arkraptor and Horyang decided to team up against Viole. [[spoiler:It didn't work]].
* In ''Webcomic/TheOrderOfTheStick'':
** Elan and Thog temporarily team up to escape from prison and travel back to the Order after Elan "fast-talk" Thog. Being both {{Cloudcuckoolander}}s, they get along surprisingly well.
** The City-State of Cliffport gives its backing to Gobbotopia's claim to nationhood, since both nations have been attacked by the elves.
** While Elan sees [[spoiler: his father]] Tarquin as evil and [[http://www.giantitp.com/comics/oots0762.html doesn't want his help at first]], later when it comes to [[http://www.giantitp.com/comics/oots0818.html defeating Nale]] they rather AgreeToDisagree.
*** And promptly subverted when Tarquin [[spoiler: allies with Nale]].
** In the {{prequel}}, the appropriately-named ''StartOfDarkness'', Right-Eye attempts (unsuccessfully) to ally with human wizard Eugene Greenhilt, despite hating humans, in order to eliminate the threat BigBad Xykon poses to his own goblin minions.
* According to ''Webcomic/ScandinaviaAndTheWorld,'' the only way to get Iran and Iraq to stop fighting each other is to present them with someone they hate more: [[http://satwcomic.com/denmark-the-artist Denmark and his Muhammed cartoon]].
* The Light Warriors of ''WebComic/EightBitTheater'' are in a constant state of this. It's stated that the greatest threat to the team is each other.
* ''Webcomic/BasicInstructions'': [[http://basicinstructions.net/basic-instructions/2011/3/3/how-to-unite-against-a-common-foe.html How to Unite Against a Common Foe]]
* In ''Webcomic/{{Homestuck}}'', the Prospitian and Dersite armies briefly [[http://www.mspaintadventures.com/?s=6&p=003840 unite against Jack]] before being [[RedshirtArmy slaughtered en masse]]; the survivors are pretty chummy from then on.
* In ''Webcomic/KiwiBlitz'', when Blitz' kiwi mecha gets impounded, she decides to steal it back. She enlists the help of an earlier foe, a master thief known as The Raccoon.
* In ''Webcomic/FafnirTheDragon'', the far right wing of the Republican Party allies itself with al Qaeda to kill UsefulNotes/BarackObama on the day of his inauguration, which sets off the first arc of the series.
* The [[AntiHero pirates]] and the [[AntiVillain Imperial Guard]] of Webcomic/DubiousCompany are forced into this after Izor's Amazing Plan gets screwed and throws everyone into an alternate dimension.
* ''Webcomic/PennyAndAggie''; during the "Popsicle War" arc, when [[AlphaBitch Meg and Karen]] and their clique (including [[TheFundamentalist Charlotte]] and [[AxCrazy Cyndi]]) executed increasingly cruel stunts against both Penny and Aggie and their respective friends, Penny(whom Aggie had previously seen as a friendly enemy) forged a truce with Aggie to stand against Meg and Karen. This led to Penny and Aggie becoming FireForgedFriends (and in later arcs [[RelationshipUpgrade something more...]]). During the final arc, Aggie wrote [[http://www.pennyandaggie.com/index.php?p=1177 a sonnet about her history with Penny,]] summing up the Popsicle War arc with this stanza:
-->"My puzzling ally--pulling me by hand,\\
From [[DespairEventHorizon deep depression's suffocating pool]]\\
She joins my friends to hers, [[BandOfBrothers making a band]]\\
Of sunshine fire, to fight the truly cruel."
* In ''Webcomic/RustyAndCo'', [[http://rustyandco.com/comic/level-6-23/ Mimic points out the wisdom of this to Yuan-Tiffany, since they don't want to kill each other.]]
* In TwoKinds [[NoNameGiven one of the main character's old friends]] is a bit biased against [[FantasticRacism Keidran]]. However when the rest of their party is incapacitated by an assassin attack, he has to [[http://twokinds.keenspot.com/archive.php?p=689 put aside some old grudges.]]
* In ''Webcomic/{{Snowflame}}'', Snowflame and his {{Hero Antagonist}}s have to work together to bail out Arkham Asylum after it is flooded with fear gas.
* In ''Webcomic/CaptainSNES'', Golbez agrees to team up with Samus Aran against Eggplant Wizard and the Monkeyspank viral AI, mainly because he knows he doesn't know enough.
* ''Webcomic/MenageA3'': The trope is briefly but eloquently demonstrated by [[http://www.ma3comic.com/strips-ma3/when_time_comes_to_play Yuki and Sonya in this strip.]] They can't stand each other, but Angel just made the mistake of challenging Yuki's ego, Sonya's competitiveness, and the woman they both love.
* In ''Webcomics/GuildedAge'', when [[spoiler:the beast the cultists let into the world]] attacks, the Peacemakers and the World's Rebellion champions agree to work together to fight it. Neither side is particularly happy about it, but both agree that the threat to innocent life is too great for them to put their own conflict before stopping it.