Haruhi Suzumiya is a Japanese light novel series written by Nagaru Tanigawa and illustrated by Noizi Ito. It was first published in 2003 by Kadokawa Shoten in Japan with the novel The Melancholy of Haruhi Suzumiya, and has since been followed by 11 additional novel volumes, an anime television series adaptation produced by Kyoto Animation, four manga series, an animated film, two original net animation series and several video games.

A light novel is a type of popular literature novel native to Japan, usually classified as young adult fiction targeting teens to twenties. The definition is very vague, and wide-ranging.