Undertale AU Wiki
Welcome to the biggest encyclopedia on Undertale AUs.

There are currently 350 articles, 10,374 files, and 207 active users on the site!

Just know that it is REQUIRED for you to read the Rules and Guidelines and the Policy of the Wiki BEFORE contributing to our Wiki.
And if you see something on this site that is yours and you are unhappy with its presence here, please contact Alphasaith with a link to the page that steals from you and a link to the proof of this being your work.

This site contains spoilers for Undertale. if you have not completed the game, you may get spoiled.

About Undertale AUs
Undertale Alternate Universes, or "AUs", are alterations to the story, world, and/or characters of Undertale, be it crossovers, changes in aesthetic, or role-swaps.

"AU" is an umbrella term that includes "ATs".

Latest activity
  • edit InterestingTale
    edited by Aathenss 2 hours ago diff
    Summary: InteresingTale:
  • edit AnotherTale
    edited by Aathenss 2 hours ago diff
    Summary: InterestingTale:
  • edit AnotherTale
    edited by Aathenss 2 hours ago diff
  • edit AnotherTale
    edited by Aathenss 2 hours ago diff
    Summary: Othertale
  • new page AnotherTale
    created by Aathenss 2 hours ago
    New page: This takes place in an altered universe where the monsters where trapped and escaped the underground much earlier. It is centered around sans papyrus...
    Summary: AnotherTale intro

    You did it!

    Is something missing? Is there a mistake? Don't be shy.
    Click the edit button and
    you can add to any page!

    You did it!

    earned the You did it! badge
    Awarded for making 10 edits on articles!

  • edit AU's End
    edited by Aathenss 2 hours ago diff
    Summary: Nightmare's Faction:
  • categorization Undernoir.
    edited by Ninadroid 6 hours ago diff
    Added categories: Serious, Concept Change

    It's a Family Reunion!

    Categories are tags that help readers find similar pages.
    Click the Add category button
    at the bottom of an article
    to list that page in a category.

    It's a Family Reunion!

    earned the It's a Family Reunion! badge
    Awarded for adding 1 article to a category!

  • new page Undernoir.
    created by Ninadroid 6 hours ago
    New page: About Edit It's an koren AU similar to mafiatale that was made by Qwuss_UT and 언더월드. Edit It was orginally called underworld, however due it...
    Summary: not much
  • edit Inverted Fate
    edited by Ninadroid 6 hours ago diff
    Summary: Miscellaneous:
  • edit DemonHunterTale
    edited by Alphasaith 7 hours ago diff
    Summary: Removing Non-Existent Template

Final check is initiated, please do not remove the Checks Out template. Wait for an Admin to come by and check off your page. Removal of the {{Checks Out}} template by unauthorized users will result in an immediate banning of the violating user lasting 3+ months. This is your only warning. Thank you for your co-operation.

What is your favorite AU? Remember to read the entire list before voting.

The poll was created at 04:04 on October 17, 2017, and so far 2381 people voted.

Sister Wikis
UTOCWiki Logo

The UTOCWiki is a sister wiki of this wiki

UTAUIdeas Wikia Logo

The UTAUIdeas Wiki is a sister wiki of this wiki

Latest Blogs