Ibas (died October 28, 457) was bishop of Edessa (c. 435–457) and was born in Syria. His name in Syriac is ܗܝܒܐ ܐܘܪܗܝܐ pronounced Ihiba or Hiba, the quivalent of Donatus. He is frequently associated with the growth of Nestorianism, although his recorded acts do not support this reputation.