Wednesday Friday Addams is a fictional character created by American cartoonist Charles Addams in his comic strip The Addams Family. The character has also appeared in television and film, in both live action and animated formats.

Wednesday is originally a pale, dark-haired, grim-looking little girl who is fascinated with death and the macabre. She seldom smiles. She is explicitly stated to be six years old in the television series' pilot episode. In the 1960s series, she is significantly more sweet-natured, although her favorite hobby is raising spiders; She is also a ballerina. Wednesday's favorite toy is her Marie Antoinette doll, which her brother guillotines. In one episode, she is shown to have several other headless dolls as well. She also paints pictures (including a picture of trees with human heads) and writes a poem dedicated to her favorite pet spider, Homer. Wednesday is deceptively strong; she is able to bring her father down with a judo hold. In the 1991 film, she is revealed to have a deep interest in the Bermuda Triangle and an admiration for an ancestor (Great Aunt Calpurnia Addams) who was burned as a witch in 1706.

Although originally portrayed as a somewhat innocent child, Wednesday Addams became one of the more openly malicious of the Addams Family ever since the original live-action movie was released and her character was depicted as one of a morbid and somewhat sadistic girl who often inflicted torture on her brother Pugsley (who seemed largely oblivious to these attempts on his life). Wednesday was also cynical and cruel to other characters though she tended to reserve her malicious stunts for her brother or for people who displeased and/or antagonized her (such as bullies).

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