Iōjima (硫黄島), also known as Satsuma Iōjima (薩摩硫黄島) or Tokara Iōjima (吐噶喇硫黄島), is one of the Satsunan Islands, usually classed with the Ōsumi Islands, belonging to Kagoshima Prefecture, Japan. Along with Takeshima and Kuroshima, it makes up the three-island village of Mishima, Kagoshima Prefecture, Japan.