Iansan (Iansã in Portuguese) is a spirit entity, or Orisha (Orixá), of the Afro-Brazilian religious faith Candomblé. Iansan is the Orisha of the winds, hurricanes and tempests. She lives at the gate of the graveyard, and has dominion over the realm of the Dead. Her name in English means "mother of nine (children).".
She is sincretized with Saint Barbara and particularly known with her association with the colour red and the salute "Epahei".
Iansan is an analogue of the Yoruba Orisha Oya or the Santería Orisha Oya-Iansa or simply Iansa.