Magical Girl Lyrical Nanoha (魔法少女リリカルなのは, Mahō Shōjo Ririkaru Nanoha) is a Japanese anime television series directed by Akiyuki Shinbo, with screenplay written by Masaki Tsuzuki and produced by Seven Arcs. It forms part of the Magical Girl Lyrical Nanoha series. The Japanese Association of Independent Television Stations broadcast 13 episodes between October and December 2004. The series is a spin-off of the Triangle Heart series and its story follows a girl named Nanoha Takamachi who decides to help a young mage named Yūno to recover a set of 21 artifacts named the "Jewel Seeds".

Masaki Tsuzuki adapted the series into a novel, which Megami Bunko published in August 2005. King Records has adapted several soundtracks and drama CDs from the series. A sequel to the anime series titled Magical Girl Lyrical Nanoha A's produced by Seven Arcs premiered in Japan in October 2005, broadcast on Chiba TV. A film adaptation of the anime series, also by Seven Arcs, was released in theaters on January 23, 2010, accompanied by a manga series which was serialized in Megami Magazine between November 2009 and March 2011.

Geneon Entertainment licensed the anime series for English-language dubbed release in North America at Anime Expo 2007 (June 29 to July 2). Due to Geneon switching distribution labels between September 2007 and July 2008, Funimation distributed the series (in a single DVD compilation-volume boxset) approximately one and a half years after the announcement of the licensing. Many production credits for the English-language dubbed release were missing. The anime is now licensed by Discotek Media.

All DVD volumes peaked at 70 to 22 and below on the Oricon Animation DVD ranking and remained on the chart for at least two weeks.