Alterfell
Ancienttale
Astertale
Astraytale
Auratale
Belieftale
Blighttale
Cardtale
Cheftale
Chesstale
Coldtale
Cyborgtale
Dancetale
Darktale (1: PokeGirl151)
Default
Demitale
Digitale (1: Nabuco88)
Digitale (2: serac111)
DivineTale
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
LoliTale
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
UNDERJUKU
Underkeep
Underlovania
Underlust (Heavy NSFW content)
Undernight
UnderShock
Understeam
Undertoy
Underwar (1: Hamatopurity)
Underwar (2: BlueWolfArtista)
Unexpectedtale
Unifell
Vintagetale
X-taleAltertale (1: Pastelaine)
Anatomical Anachronisms/Asgore's Wars, Within, Without
AngstTale
Arttale
Bikertale (Light NSFW content)
BlueRoseTale
Bluetale
Brotale
CalmTale
Chaostale
Conquredtale
Copy_Tale_
EssenceTale
Flowertale
Forestale
GZtale
Heart and Soldier
Hybridtale
Hypertale (1: unknown)
Powertale
Purgatale
Risingtale
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.
Aethertale
Alternate Universe Police
Arabiantale
Arena Tale
Asriel and the Black Knight
Beggartale
Cloudtale
CPUtale
Cybertale
Darktale (2: jessa33)
Deeptale
Dreamtale (2: ParanoidFluff)
DrugTale
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
Understat!c
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.
Blookytale
Cattale
Demontale
Gargoyletale
Nyandertale
Puppettale Removed
Rainbowtale (2: MisakiMagic)
Speciestale Removed
Thundertale
Underscale
Underswitched (1: shadowrosa6)
Underwolves
Woventale
Zodiactale
Switch Up (<-THIS IS A LINK)
Altertale (2: Friisans)
Blendertale
Changed Fate
Changetale
Displacedtale
Equationtale
Fableturn
FlipSwitch Removed
Inverted Fate
Jumbletale
Lateshift
Messtale
Mirrors Change
Modtale
Storyshift
Storyspin
SuperSwapTale
SuperSwitch
Swapdertale
Swapspin
Switchedtale
Tale Mix
Tale's End
Taleshift
TaleTwist
Twirling Incidentally Previously "SwitchingQuest"
Underbroken
Underchange
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)
Fracturetail
Glitchtale
Insomnia
King Papyrus
LASTtale
Lonelytale
Megatale
Nexttale
Nexustale
Notale
Omega!sans/The Thought
Once Again
Overwar
Petaltale
Rebirthtale
RiseTale
Ruins!AU
Sadtale
Sametale
Securitale
Sondertale
SORRYTale (1: RessurectedNightmare)
Soultale (3: thepeng101)
Swaptale
The True Hero
ThreeTale
Underdeath
Underglitch (2: Dimonds456)
Underlevel
Underlight
Undermess
Under_MyShelter
Underplead
Undersanity
Understanding
Understay
Undertale: Chaos Edition
Undertale: Save
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
Chara!Sans
Chasriel
Comic Papyrus
Corrupt Beast Sans
Dreemurr Reborn
Electrotale
EmptyTale
EPOCHTALE
Experiment-Undertale.exe
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
SoulSwap
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
Innotale
OrchidTale
Qarms/Qarmic Sans
Rewind
RNCTale Removed
SecondTale
Shadowtale
Sithtale
UnderControl
Undertale: Multiplay
Undrrdell
Unstable Souls
WanderTale
Wishtale
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
A Child and a God
CORE!Frisk
Datatale
DEADtale NEWLY ADDED
Doomtale
Dreamtale (3: jokublog)
Errortale
EquilibriumTale
Flower sans
Inktale
Mirrortale
NoLifeTale
One in a Million
Paint-Thinner!Sans
Re-Mixtale
RipTale
Sentinaltale
Skulltale
Statictale
Stringtale
Timetale
Ticktock!Sans
tumblr!Sans/Techno!Sans
Undersane
Vixentale
For the LOLs (<-THIS IS A LINK)
AUs that are purely made for bringing a smile to your face. Some are cute, some are funny… A lot aren't very serious.
Acidtale
Bazookaswap
Canadtale
Chill
Christmas Party
Chromotale
Craptale
Cubetale
Dundertale
Failtale
High Quality Tale
Jalizatale
Jerrytale
Just A Head
Kindertale
Lennytale
Littletale
MagicTale
Mettasansey
Nekotale
Nintendotale
Nootnoottale
Pick-upTale
PTA Undertale
Randomtale
RussianTale
Sanstale
Shiannesetale
Shiptale
Skypetale
Spritertale
Studiotale
Tale From Below
Treetale
Undercrap
Underdog
Underfail
Under(her)tail (VERY heavy NSFW content!)
Underfresh
Undernovela
UnDERPtale
Understale
Underwear
Undynetale
Voodootale
Weabootale
Yoshitale
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
Bloodtale
Brokentale (1: hummingkitten)
Brothertale
Chaostale
Charatale (1: Chica-the-chicken101)
Comatale
Darkertale
Disillusionmenttale
Distortale
Dust-Tale
Faketale
Fearstale
Flowey is Not a Good Life Coach
Flowriel
Fonttale
Forgivenesstale
Forsakentale
Frettale
Handplates
Hangingtale
HELPtale
Horrortale (1: Unknown)
Horrortale (2: Sour-Apple-Studios)
Infecttale
Lifelesstale
Lightless-tale
Madmanstale
Masktale
Mercytale
Monstertale
Morbidtale
ONCEtale
OverDosed
Playbacktale
Powdertale
Predator
Shadowfallen
Sixbones
Sorrytale (2: DragonArtStudios)
StRaNgE/\Tale
Subject 52
Tales of Emptiness
The Demon and the Angel
The Purpose
Twistedtale (2: sansylovely)
Underchosis
Undercode
Underdark (1: deathwithundertale)
Underdarkness
Underdread
Underelectricity
Underhell (1: z0mb3xor)
Underinferno
Underscare
Undershift (2: Sans-Skelebro)
Underslept
Undersurvival
Undertaint
Underterror
Underworld (1: coulsart)
Underworld (2: Two--Faced--Angel)
Und_rt_le
Worthtale Moved from Special Event
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
Fullmetal Undertale
Helltale (1: TheGeneralofSouls34)
Kurotale
Nationtale
Souldust Crusaders
The Heros of Underground
Trickstertale
Trickstervirus
Undergames
Understuck (1: FlintIsTrash)
Understuck (2: PumpkinLOL)
Urbantale
Warriorcatstale
Warrior's Tale
Warriortale
Television (<-THIS IS A LINK)
Crossovers between Undertale and movies or television series.
Anime and Cartoon tale
Applefell
Anurtale
Berktale
Bill!Sans
Bunkertale
Calcium Man
CrusadeTale
Detectivetale
Disneytale
Dragontale
Friendship and Determination
Gametale
GarnetTale
Gemtale
Gothamtale
Guildtale
Kirbytale
Lunatale
MarbleTale\UnderHornets
Marveltale
MylenaHoodTale
Nevertale
NZTtale
RWBYtale
Shiningtale
Simulatale
Slendertale
Spongetale
Steven's Tale
Stranger Tales
Undernatural
Who Tale
Wondertale (1: Unknown)
Wondertale (2: mintlovingkitten)
Wundertale
Yu-Gi-Tale
Games (<-THIS IS A LINK)
Crossovers between Undertale and another game.
Angel-Tale
AnOFFtale
Bordertale
Candy'stale
Dr. Underdote
Embodiment of Undertale
Engietale
Fallouttale
FNAFtale
Foundationtale
Geometrytale
Hedgetale
Ibtale
Into The Stars
Kingdomtale (2: Ashlex-in-pearl)
Madnesstale
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
UnderHill
Undermon (1: Unknown)
Undermon (2: thegreatrouge)
UnderNaf
UnderSky
Under Story
Undertale Fortress 2
Undertale Mystery Dungeon
Undertoad
Underwatch
WOWtale
Xenotale
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.
Beatlestale
Charatale (2: CraftingChic)
Creative tale
Crossovertale
Crosstale (1: PolishCrossoverFan)
Cross-Under
DeviantTale
Hostiletale
Legandstale
Mytale
OCtale (1: askmesnekvince)
OCtale (2: byehelena)
OCTale (3: nicothekiller123)
Of Monsters of Undertale
Phoenixtale
Portertale
Steamtale
Swantale
Thaumatale
Thompson's Tales of the Underground
Trashtale
Underette
Undertronic
Vocatale
AUs of AUs (<-THIS IS A LINK)
AUs that are a combination of two other AUs or modifications to pre-existing AUs.
An Icy Echo
Arsonfell
AU Tournament
Fatal_Error
FightShift Removed
Flowerfell
Heavenfell
Horror!Ink
Maidtale (Moderate NSFW content)
Revengeswap Removed
Sans's SSD
Suicidal Blueberry
Swapfell/Fellswap
TurnedSwivel
Undertemper
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 (1)
Temmietale
Underfalls/Gravitytale
Undertalia (на заметку)