IKA, or Idrima Kinonikon Asfaliseon (Institution for Social Insurance) was one of the main social security public organisations in Greece. Founded in 1934, it also operated its own healthcare services, which were later incorporated into ESY. Since 2017, IKA is a part of a consolidated social security organisation called EFKA, or Enieos Foreas Kinonikon Asfaliseon (Unified Body for Social Insurance).