Hanako-san, or Toire no Hanako-san (トイレの花子 (はなこ)さん, "Hanako of the Toilet"), is a Japanese urban legend about the spirit of a young girl named Hanako who haunts school toilets. Like many urban legends, the details of the origins of the legend vary depending on the account; different versions of the story include that Hanako-san is the ghost of a World War II–era girl who was killed while playing hide-and-seek during an air raid, that she was murdered by a parent or stranger, or that she committed suicide in a school toilet due to bullying.
Legends about Hanako-san have achieved some popularity in Japanese schools, where children may challenge classmates to try to summon Hanako-san. The character has been depicted in a variety of media, including films, manga, anime, and video games, and not just as the notorious Hanako-san but in some as Hanako-kun, the male version.