Fati is the god of the Moon in Tahiti and Society Islands mythology, described as a son of Roua and Taonoui. Some reference works also spell the name Faiti or Fardu. He is a minor figure in Polynesian myth, and the surviving record is thin, passed down through chants and genealogies rather than long stories.

He is known for his link to lunar cycles, night light, tides, coastal navigation, and the calendars that guided fishing and planting. Sources say his worship was