Halloween

 may refer to:
 * The Treehouse of Horror XXIII Event, the game's first major event, released in October 2012
 * The Treehouse of Horror XXIV Event, the game's fifth major event, released in October 2013
 * The Treehouse of Horror XXV Event, the game's 11th major event, released in October 2014
 * The Treehouse of Horror XXVI Event, the game's 17th major event, released in October 2015
 * The Treehouse of Horror XXVII Event, the game's 23rd major event, released in October 2016
 * The Treehouse of Horror XXVIII Event, the game's 29rd major event, released in October 2017
 * The Treehouse of Horror XXIX Event, the game's 35th major event, released in October 2018
 * The Treehouse of Horror XXX Event, the game's 5th multi-event, released in October 2019
 * The Treehouse of Horror XXXI Event, the game's 11th multi-event, released in October 2020