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Oh My Goddess! (Japanese: ああっ女神さまっ, Hepburn: Aa! Megami-sama), or Ah! My Goddess! in some releases, is a Japanese manga series written and illustrated by Kōsuke Fujishima. It was serialized in Kodansha's seinen manga magazine Monthly Afternoon from September 1988 to April 2014, with its chapters collected in 48 tankōbon volumes. The series follows college sophomore Keiichi Morisato and the goddess Belldandy who moves in with him in a Buddhist temple; after Belldandy's sisters Urd and Skuld move in with them, they encounter gods, demons and other supernatural entities as Keiichi develops his relationship with Belldandy. The manga series has been licensed for English-language release by Dark Horse Comics.

The series was adapted into an original video animation produced by Anime International Company (AIC), and an anime series which aired from 2005 to 2006. Additionally, AIC has developed two OVAs and a film, and OLM, Inc. has also developed an anime series as well. Companies have developed thousands of types of merchandise, such as video games, and a light novel. The OVA was licensed by AnimEigo, while the film was licensed by Geneon Entertainment, and the various TV series were licensed at various points by Media Blasters, ADV Films and Funimation.

As of June 2020, the manga had over 25 million copies in circulation. In 2009, Oh My Goddess! won the 33rd Kodansha Manga Award for the General category.