Lua error in Module:Unicode_data at line 468: attempt to index field 'scripts' (a boolean value). (also known as SAO) is a 2009 Japanese light novel series written by Reki Kawahara and illustrated by abec. The series is about many virtual reality video game worlds.

Sword Art Online was commercially successful. According to Oricon, SAO was the top selling light novel series of 2012. More than 16 million copies of the light novel has been printed. The novel was later acted into a Japanese Anime.