The Little Mermaid is a 1989 Disney animated film based on the fairy tale by Hans Christian Andersen. It follows the story of a mermaid princess named Ariel who dreams of living on land and falling in love with a human prince.
The "The Little Mermaid" title lettering of the movie poster closely resembles the Mermaid font, created by Kustren, a user on DeviantArt. You can easily download this font for free from the Fonts Used Section.