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Comycatdarkangel will be taking over maintaining this list. Find their post here: A guide to Undertale AU's 2
Go give them support! c:



Theme


Every single character in Undertale is changed. AUs that only affect some of the characters are not found here, nor are AUs that change only during the time Frisk is within the underground.

Basic Change (<-THIS IS A LINK)


The basic theme of Undertale is changed, flipped, or modified while still remaining in the same basic story in some which way or form. Most of these AUs have their own versions of the characters. It usually follows a specific theme,

Alterfell
Astertale
Astraytale
Auratale
Belieftale
Blighttale
Cardtale
Cheftale
Chesstale
Coldtale
Cyborgtale
Dancetale
Darktale (1: PokeGirl151)
Default
Demitale
Digitale (1: Nabuco88)
Digitale (2: serac111)
Dreamtale (1: tTOBIi)
Dümmchentale/Dummietale
Eclipsetale
Elementaltale (1: reyindee)
Elementaltale (2: Hawkmask101)
Element-tale
Emotale
Emotiontale
Epictale
FightStory
Finntale
Formtale
Genderswap
Gloomytale
Happytale
HardTale
Haventale
Hometale
Hopelesstale
Humanitytale
Hungertale
Hymmnetale
Icetale
Inversetale
Joseontale
Legendtale
Linetale
Lucktale
Magmatale
Manatale
MartialTale (1: JelliJellatin)
Mettatale
Miloswap
Missingtale
Monofell
Morphtale
Musical Tale
Mythitale
Negatale
Nextale
Not A Tale
Offtale (1: LessSess + MBDprojects1234)
Oppositetale (1: kellenkyo)
Orphantale (1: PrincessMistyMire + TheLunarPrincess15)
Overtale
Pastrytale
Petale
Positale
Puritale
Reflectiontale
Revoltale
Rewindtale
Royal Souls
Seventhtale
Singtale
Sorcerytale
Soultale (1: Burning-Sol)
Soultale (2: MultiMugen)
Spadetale
Spectretale
Stylishtale
Sugartale
Technotale
The Fallen Knight
True ChaosTale 
Twistedtale (1: BlazePandora)
Ultratale
Under-Band
Underbed
Underbend
Underborn
Underchill
Undercute
Underfalse
Underfates (1: sonicgirl313)
Underfell
Underghost
Underglitch (1: MikeyDoesArt)
Underguild
Underhaven
Underheart
UNDERHOPE
Underill
Underkeep
UNDERKEI
Underlovania
Underlust (Heavy NSFW content)
Understeam
Underwar (1: Hamatopurity)
Underwar (2: BlueWolfArtista)
Unexpectedtale
Unifell
X-tale

Concept Change (<- THIS IS A LINK)


The Underground tends to remains the same, but the basis of the story itself changes. Sometimes the appearance of characters are different. The dynamics of how battles, magic, and monsters work could also be changed, as well as their end-goal.

Anatomical Anachronisms/Asgore's Wars, Within, Without
AngstTale
Arttale
Bikertale (Light NSFW content)
BlueRoseTale
Bluetale
Brotale
CalmTale
Chaostale
Conquredtale
Copy_Tale_
EssenceTale
Flowertale
Forestale
Furytale
GZtale
Heart and Soldier
Hybridtale
Hypertale (1: unknown)
Powertale
Purgatale
Saintale
SoullessTale
SplitPersonaliTale
SportsTale
TopTale
Underloop
Undermystic
Underpire
Underscape
Undersick
Underslayer
UnderStone
Understrife
Undersurface
UNDERTALE :: Enlightenment
Undertall
UnderThread
Unknowntale (1: neko_fell-chan)

Outside the Underground (<- THIS IS A LINK)


The story does not take place within the Underground.

Alternate Universe Police
Arabiantale
Arena Tale
Beggartale
Cloudtale
CPUtale
Cybertale
Darktale (2: jessa33)
Deeptale
Dreamtale (2: ParanoidFluff)
Earthtale
Enchantedtale
Fairytale
Fantasytale
Justicetale
Kingdomtale (1: Deaths-Wonderland)
Life on the Surface
Mountaintale
Oceantale
Orphantale (2: MysticTeaDancer)
Other Story
Outertale
OVERGARDE
PinoyTale
Play-TimeTale
Rainbowtale (1: kirbypuff326)
Reapertale and Reverse Reapertale
ReincarnaTale
SBTale
Scholatale
Seatale
Skeletale (1: SBReece)
Skytale
Spiritale
Survivortale
Tribaltale
TropicTale
Underfates (2: SparkyBytes)
Underfight Club
UnderIsle
Undermafia
UnderONLINE
Under_Pray
Undersail
Undersea
Undertide
Undertop
Undertale: The Faithful
Undertravel
Undervirus
Unknowntale (2: Skies-Never-Fall)
UT Gangster
UTmob
Zephyrtale

Species Swap (<-THIS IS A LINK)


The species of all the characters have changed. Being changed into objects also works here.

Cattale
Demontale
Gargoyletale
Nyandertale
Rainbowtale (2: MisakiMagic)
Thundertale
Underswitched (1: shadowrosa6)
Underwolves
Woventale
Zodiactale

Switch Up (<-THIS IS A LINK)


Some or all of the canon Undertale characters swap roles with the other canon Undertale characters. e.g: Sans replaces Toriel. No new characters are added, and the story is relatively the same for most.

Altertale
Blendertale
Changed Fate
Changetale
Displacedtale
Equationtale
Fableturn
Inverted Fate
Jumbletale
Lateshift
Messtale
Mirrors Change
Modtale
Storyshift
Storyspin
SuperSwapTale
SuperSwitch
Swapdertale
Swapspin
Switchedtale
Tale Mix
Tale's End
Taleshift
TaleTwist
Twirling Incidentally
Underbroken
Underchanged
Underscramble
Underswap
Underswitched (2: C4MIL0)
Undertrade
Undertwist
Universe Change

Special Event (<-THIS IS A LINK)


Everything in the timeline would have been the same to canon Undertale if it were not for a specific event that changed the direction of the story within or after the reset-able timeline. This means after Frisk falls down. The change affects most or all characters, otherwise it belongs in Few Characters.

AbandonedAU
Aftertale
Amalgamate!Asriel
Amnesiatale
Anomalytale
Astraltale
Blendtale
Burstale
Choice
Chronotale
Clocktale
Combined Hopes and Dreams
Corruptionfile.UT
Cursedtale
Dustjar
Echotale
Fallentale
File-1
File Loaded
Foundlingtale
Fusiontale
Futuretale (1: Unknown)
Glitchtale
Insomnia
King Papyrus
LASTtale
Lonelytale
Megatale
Nexttale
Nexustale
Notale
Omega!sans/The Thought
Once Again
Overwar
Rebirthtale
Ruins!AU
Sadtale
Sametale
Securitale
Sondertale
SORRYTale
Swaptale
The True Hero
ThreeTale
Underglitch (2: Dimonds456)
Underlevel
Undermess
Under_MyShelter
Underplead
Understanding
Understay
Undertale: Chaos Edition
Undertime
Zombietale

Few Characters


AUs that do not affect all the characters. These include headcanons, extensions, and flat out new ideas.

Tweak (<-THIS IS A LINK)

One or very few characters are tweaked within the story. They still live within the Underground.

Afterfell
ArachnoTale
Ashtale
AurumTale
Baby Bird
Baby Blasters
Blind Frisk
Broalgamate
Chasriel
Comic Papyrus
Corrupt Beast Sans
Dreemurr Reborn
Electrotale
EmptyTale
Fataltale
Frisk's Anomalous Adventures
Gasterfell
Generationtale
Goopytale
Grouptale
Guardtale
Half-Hearted Dreamers
Impaired
Innocent!Chara
Judgement Hall
Lost Vessel
Needlessly Complicated Sans
Pasttale
RemembranceTale
Reset!Frisk
Royal Babybones
Science Sans
Shadowtale
Siblingtale
Skele-Frisk
Something's Missing
The Lost Sibling
Underding
Underhuntre
Underline

Underpatch
Undershift (1: Magainita)
Undertone
UnderTruth
Voidreversal
What Are Friends For

Add (<-THIS IS A LINK)


One or very few characters are added to the story. They still live within the Underground. AUs where a character is replaced with a new one are also found here.

Akintale
Beyond the stars / Más allá de las estrellas
Charise
Chisk
FriendshipTale
Qarms/Qarmic Sans
Rewind
Sithtale
UnderControl
Undertale: Multiplay
Undrrdell
Unstable Souls
WanderTale

Out-code Characters (<-THIS IS A LINK)


One or few characters are able to jump AUs and travel the multiverse, usually having a home base in some sort of void or pocket dimension. Some can only view other AUs.

Abysstale
CORE!Frisk
Datatale
DEADtale
Doomtale
Dreamtale (3: jokublog)
Errortale
Flower sans
Inktale
Mirrortale
NoLifeTale
One in a Million
Paint-Thinner!Sans
Re-Mixtale
RipTale
Sentinaltale
Statictale
Stringtale
Ticktock!Sans
tumblr!Sans/Techno!Sans
ULTRA!TALE

Comedy (<-THIS IS A LINK)


AUs that are purely made as a joke or to in some way bring a smile to your face. A lot aren't very serious.

Acidtale
Bazookaswap
Christmas Party
Chromotale
Failtale
High Quality Tale
Just A Head
Kindertale
Littletale
MagicTale
Mettasansey
Nekotale
Nootnoottale
PTA Undertale
Randomtale
RussianTale
Shiannesetale
Shiptale
Spritertale
Studiotale
Tale From Below
Treetale
Undercrap
Underdog
Underfail
Under(her)tail (VERY heavy NSFW content!)
Underfresh
Undernovela
Underwear
Undynetale
Voodootale
Weabootale
Youngtale

Horror (<-THIS IS A LINK)



Warning: Some of these AUs contain themes that may be disturbing to some viewers.
AUs with the goal of creating something scary, insane, or disturbing. Some AUs that follow the genocide route are also found here, but not all are geno-route-only. Some possible themes include suicide, drug use, alcohol use, depression, death, gore, insanity, disfigurement, etc.

It is suggested you read the short bios of these before googling them!

Alimagtale
Anti-Physicstale
Asylumtale
Brokentale (1: hummingkitten)
Chaostale
Charatale
Distortale
Dust-Tale
Fearstale
Flowey is Not a Good Life Coach
Flowriel
Fonttale
Forgivenesstale
Forsakentale
Handplates
HELPtale
UnderTomb Previously named "Horrortale"
Horrortale
Infecttale
Lifelesstale
Lightless-tale
Madmanstale
Masktale
Monstertale
Morbidtale
Playbacktale
Powdertale
Predator
Shadowfallen
Sixbones
StRaNgE/\Tale
Subject 52
Tales of Emptiness
The Demon and the Angel
The Purpose
Twistedtale (2: sansylovely)
Underchosis
Underdark (1: deathwithundertale)
Underdarkness
Underelectricity
Underhell (1: z0mb3xor)
Underinferno
Understrings
Undertaint
Underterror
Underworld (1: coulsart)
Underworld (2: Two--Faced--Angel)
Und_rt_le
Worthtale

Crossovers


A mixture of a story, game, movie, TV show, book, or personal characters and Undertale.

Stories (<-THIS IS A LINK)


Crossovers between Undertale and a book, comic, or webstory.

Creepytale (1: karma2u)
Creepytale (2: Lupus-Tontrue)
Diverge
Nationtale
Souldust Crusaders
Trickstertale
Trickstervirus
Undergames
Understuck
Warriorcatstale
Warrior's Tale

Television (<-THIS IS A LINK)


Crossovers between Undertale and movies or television series.

Anime and Cartoon tale
Applefell
Bill!Sans
Bunkertale
CrusadeTale
Disneytale
Dragontale
GarnetTale
Gemtale
Kirbytale
MylenaHoodTale
Nevertale
NZTtale
RWBYtale
Simulatale
Slendertale
Spongetale
Steven's Tale
Stranger Tales
Who Tale
Wondertale
Wundertale
Yu-Gi-Tale

Games (<-THIS IS A LINK)

Crossovers between Undertale and another game.

Angel-Tale
AnOFFtale
Bordertale
Candy'stale
Engietale
Fallouttale
FNAFtale
Geometrytale
Hedgetale
Ibtale
Into The Stars
Kingdomtale (2: Ashlex-in-pearl)
Majoratale (1: Smieska + Owlyjules)
Neptunia x Undertale: The Saving Heart
NiGHTale
Papertale (1: mr-pengu1n)
Pokétale
Portale
The Green Soul of the Underground
Touhoutale
Trainertale
TransforTale
UnderHill
Undermon (1: Unknown)
Undermon (2: thegreatrouge)
UnderNaf
UnderSky
Under Story
Undertale Fortress 2
Undertoad
WOWtale
Yanderetale (1: Yandere Dev)
YandereTale (2: Tanyt262)

Other (<-THIS IS A LINK)


Any other kind of crossover or parody, including real people or real life events, original characters, a YouTube series, or a combination of many things.

Cross-Under
DeviantTale
OCtale (1: byehelena)
OCTale (2: nicothekiller123)
Steamtale
Thaumatale
Thompson's Tales of the Underground
Undertronic

AUs of AUs (<-THIS IS A LINK)


AUs that are a combination of two other AUs or modifications to pre-existing AUs.

Arsonfell
Charafell
Fatal_Error
Flowerfell
Heavenfell
Momma CQ Newly Added
Sans's SSD
Suicidal Blueberry
Underverse

Community Shared (<THIS IS A LINK)


AUs made by large parts of the community as a whole, instead of by just one person. These are not collab AUs. Crossovers with many different variants show up here as well.

Disbelief Papyrus
Floweypot
Jaspertale
OFFtale (2)
Personatale
Ponytale
Swapfell/Fellswap
Temmietale
Underfalls/Gravitytale
Undertalia

AU Mass Producers

People who have made multiple AUs, and have put them in a list with similar format to the rest of this one.
Reminder that if you make 5 OR MORE AUs AND want ALL of them on this list, you need to make a journal or text deviation for me to link into this category! It keeps the list at least a little clean!

Names of AUs shown from people's lists have progress made on them and are counted in the description's number.

:iconsupersmashsyd:'s AUs: My Undertale AUs
(PMDtale, Underwarriors + 10 others)

(Flowriel, Shattertale + 18 others)

(Underfallen + 17 others)

:iconkenny1221:'s AUs: Every Single Undertale AU of Mine
(Elementale (2), Helltale (2) + 5 others)

:iconlaura10211:'s AUs: Undertale AU list (WIP)
(ShuffletaleFloweytale, Wolftale, Amalgam Queen, Crosstale (2), Ninjatale + 5 others)

:iconbluesky-of-fire:'s AUs: My Undertale AU Ideas
(Playertale, 
HarvestTale: UnderSoul Parade + 3 others)

:iconofficial-duo-au:'s AUs: List Of Undertale Alternate Universes!
(Underspell, Imaginationtale (1), Nagatale + 8 others)

:iconimaginaslight:/:iconsapphony:'s AUs: Undertale A.U. Ideas
(MECHATALE, Imaginationtale (2), Dubsteptale, Hypertale (2), Webtale + 11 others)

:iconminty-draws:'s AUs: AU Progress
(Undershift (3), CSTC, Stigmatale, Looptale, in control, Your Best Friend + 7 others
)

:iconleaderoffeeless:'s AUs: My UnderTale AU's (list)
(10 AUs)

:iconhalloweenmew:'s AUs: All of my AUs
(Clockworktale, IceCreamtale, Picarto Sans, Five Nights at Undertale AUs, LavenderTowntale, Truth Sans and Ideal Papyrus + 8 others)

:iconthesmithsart:'s AUs: All of my AU's
(
Undercollection + 10 others)

:iconthelordofgames:'s AUs: thelordofgames.deviantart.com/…
(SCP-Tale + 8 others)


:iconundertale-au-creator:'s AUs: www.wattpad.com/story/80969150
(
FamiliarTale + 12 others)

:iconundertaleaukingdom:/:icontazannathewolf:'s AUs: 'Mass Producers'
(
Underatle OMS, UnderTrainerHamiltontale + 3 others)

:iconflambeworm370:'s AUs: My Undertale aus
(Scorched tale, Dusktale + 6 others)

:iconnikikeya-chan:'s AUs: MY UNDERTALE AU'S
(
Voidtale, Sherlocktale, Socktale, Undersilence, Co-Habitation, Skellaton AU, Regency)

:iconnameles-existance-ug:'s AUs: MY AU/AU's
(7 AUs)

:iconannathewriter:'s AUs: Bundle of Universes!
(
Undersymph, Worktale, Researchtale, Underhaunted, Fall of the Souls + 9 others)
Varients of Alpha and MainSwitch: docs.google.com/document/d/1HQ…

AU ideas other people can use
Bucket of Ideas! (4 AUs)

pastebin.com/aKJbMHbv (2 AUs)

611 AUs in total.

Before you ask about an AU, click the titles of categories to see descriptions of them, as well as links.
Press ctrl+f and type in the name of the AU you're looking for.


THANK YOU TO ALL WHO'VE HELPED! And many thanks to :iconcomycatdarkangel: who has taken over
Be sure to take a look at any that seem interesting, and support the artists behind the work! :D

All AUs belong to their respected owners.
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January 3, 2016
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