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Sword Art Online (Japanese: ソードアート・オンライン Hepburn: Sōdo Āto Onrain) is a Japanese light novel series written by Reki Kawahara and illustrated by abec. The series takes place in the near-future and focuses on various virtual reality MMORPG worlds. The light novels began publication on ASCII Media Works' Dengeki Bunko imprint from April 10, 2009, with a spin-off series launching in October 2012. The series has spawned eight manga adaptations published by ASCII Media Works and Kadokawa. The novels and four of the manga adaptations have been licensed for release in North America by Yen Press.

An anime television series produced by A-1 Pictures aired in Japan between July and December 2012. An Extra Edition episode aired on December 31, 2013, and a second anime series, titled Sword Art Online II, began airing in July 2014. A video game based on the series, Sword Art Online: Infinity Moment, was released on PlayStation Portable in March 2013, with a second game, Sword Art Online: Hollow Fragment for PlayStation Vita (PS Vita) released in April 2014. A third game, Sword Art Online: Lost Song, will be released on PlayStation 3 and PS Vita in March 2015.

Sword Art Online has received widespread commercial success, with the light novels having over 16 million copies printed in several countries including Japan, Taiwan, China, South Korea, Thailand, the United States, Canada, and the United Kingdom. The anime series has received mixed to positive reviews from critics, with some praising the exploration of the psychological aspects of virtual reality, while others criticized the series' pacing and writing.