Абӯаҳмад Убайдуллоҳ ибни Абдуллоҳ ибни Тоҳир (ар. ابواحمد عبیدالله بن عبدالله بن طاهر; 838, Нишопур — 21 май 913, Бағдод) — сарлашкар ва шоҳзодаи хуросонӣ, амири тоҳирии Бағдод (867—891), писари Абдуллоҳ ибни Тоҳир.
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