Mermaid A mermaid is a mythical creature with the upper half of its body resembling a beautiful woman and the lower half resembling a fish's tail. These creatures appear in the mythology and folklore of many cultures, especially in seafaring tales. Mermaids are often symbols of beauty, allure, the mystery of the ocean, and sometimes deception and danger. They are most famously depicted in stories such as Hans Christian Andersen's "The Little Mermaid."