Hans Christian Andersen's The Little Mermaid (アンデルセン童話 にんぎょ姫, Anderusen Dōwa: Ningyo-hime, lit. 'Andersen's Fairy Tales: Princess Mermaid') is a Japanese anime film based on Hans Christian Andersen's 1837 fairy tale, released in 1975 by Toei Animation. Unlike the Disney adaptation released 14 years later, this film is closer to Andersen's story, notably in its preservation of the original and tragic ending. The two main protagonists are the youngest daughter of the royal family, Marina, and her best friend Fritz, an Atlantic dolphin calf. In Japan, this film was shown in the Toei Manga Matsuri (Toei Cartoon Festival) in 1975.

The film was later released in the United States, dubbed into English by G. G. Communications, Inc. and Prima Film, Inc., on February 4, 1978, under the title: Hans Christian Anderson's The Little Mermaid (Andersen's name would be correctly spelled in subsequent releases).

Comedy podcast RiffTrax (Michael J. Nelson, Bill Corbett and Kevin Murphy) recorded and released a riff in 2024.