Moetan (もえたん) is a series of English language study aids published by SansaiBooks in Japan.

Targeted at otaku, it attempted to teach English words using examples drawn from computer games and anime.

The acronym may have been chosen as a play on combining the words moé and -tan, both terms of cuteness used in relation to girl characters in anime, to create a portmanteauic double meaning.

Each chapter consists of a short story, written in pure Japanese, concerning the adventures of "Nao-kun" (a high school student) and "Ink-chan" (a mysterious magical girl who arrives to help him with his studying), followed by a set of word examples.

Bandai Visual, Planet Entertainment, Actas, and Hakuhodo DY Media Partners Incorporated produced a television series based on the book.

[3] Home page of the TV series hosted 4 square comic strip that are updated daily starting from 2007-07-09.

Lantis sold soundtrack CD for the opening and ending songs of the TV show on July 25, 2007 and August 8, 2007 respectively.

Tetsuya Takahashi produced a comic book titled Moetan Magical Busters, please save the world!