The Asii, Osii, Ossii, Asoi, Asioi, Asini or Aseni were an ancient Indo-European people of Central Asia, during the 2nd and 1st centuries BCE. Known only from Classical Greek and Roman sources, they were one of the peoples held to be responsible for the downfall of the Greco-Bactrian Kingdom. In Greek Mythology they were the children of Iapetus and Asia.