Negima! Magister Negi Magi, known in Japan as Magical Teacher Negima! (Japanese: 魔法先生ネギま!, Hepburn: Mahō Sensei Negima!), is a Japanese manga series written and illustrated by Ken Akamatsu. It was serialized in Kodansha's Weekly Shōnen Magazine from February 2003 to March 2012, with its chapters collected into 38 tankōbon volumes.

Negima! was adapted into a 26-episode anime television series produced by Xebec that was broadcast on TV Tokyo from January to June 2005. A second 26-episode series produced by Shaft titled Negima!?, which is alternate retelling, was broadcast on TV Tokyo from October 2006 to March 2007. In addition, four different sets of original video animations, an anime film and a live-action television series have also been produced.

In North America, the manga was licensed for English language release by Del Rey Manga and later by Kodansha USA. In the UK the first sixteen volumes were published by Tanoshimi. Both anime and the second OVAs were licensed by Funimation. Sentai Filmworks re-licensed the series in 2018. In 2023, Sentai lost the streaming rights to Negima and it was removed from HIDIVE.

Akamatsu collaborated with an artist named Yui to write the spin-off Negiho in 2010. In 2013, Akamatsu began a sequel/spin off titled UQ Holder! that focuses on Negi's grandson, Tōta Konoe. Due to the two anime series and live action TV shows having plots that are totally different from that of the Manga and the existence of spin-off manga that are fresh new takes of the Negima plot, Negima has become subject to Transmedia storytelling.