Ayar Al'arshi (Larabci: آيَة الْكُرْسِي, romanized: ʾāyat al-kursī) ita ce aya ta 255 a cikin suratu ta biyu ta Alƙur'ani, Baƙarah (Q2: 255). Ayar tana magana akan yadda babu wani abu kuma babu wanda ake yiwa kwatankwacin Allah. Wannan ita ce sananniyar ayoyin Alkur'ani kuma an haddace ta sosai kuma ana nuna ta a duniyar Musulmi. Sau da yawa ana karanta shi azaman al'adar sihiri don nisantar aljanu. Ayar Al'arshi ta ƙunshi jimloli goma. Ana daukar Ayatul Kursi a matsayin babbar ayar Alqur'ani kamar yadda hadisi ya nuna. Ana ɗaukar ayar a matsayin ɗaya daga cikin mafi ƙarfi a cikin Alƙur'ani domin idan ana karanta ta, ana ganin girman Allah ya tabbata. Mutumin da ya karanta wannan ayah safe da yamma zai kasance cikin kariyar Allah daga sharrin aljanu da shaiɗan (aljanu); wannan kuma an san shi da adkhar na yau da kullun. Ana amfani da shi wajen fitar da jiki, don warkewa da kariya daga aljanu da shayatin. Domin an yarda Ayar Al'arshi tana ba da kariya ta ruhaniya ko ta jiki, Musulmai sukan karanta ta kafin su tashi tafiya kuma kafin su yi barci.