[b]Sword Art Online: Alicization[/b] is the fourth main story arc in the [[Sword Art Online]] light novel series written by Kawahara Reki and illustrated by [[bunbun]].

An adaptation aired on October 6, 2018 until March 30, 2019, and covered the events from the novel's ninth volume, [i]Alicization Beginning[/i], to the fourteenth volume, [i]Alicization Uniting[/i]. The second part of the anime, titled [[Sword Art Online: Alicization - War of Underworld]], adapts from the novel's fifteenth volume, [i]Alicization Invading[/i], to the eighteenth volume, [i]Alicization Lasting[/i].
アリシゼーション