Hazrat Ala ud-Daula Simnani (رحمتہ اللہ علیہ)(Persian: علاءالدوله سمنانی, full name Shaikh Abu-Al-Makarim Rukn-ud-Din Ala ud-Daula Ahmed Bin Muhammad Bin Ahmed Bayabanki Simnani ; 1261-1336) was a Persian Sūfī of the Kubrāwī order,a writer and a teacher of Sufism. He was born in Semnan, Iran. He studied the tradition of Sufism from Hazrat Abud al- Rahman Asfariyeni (رحمتہ اللہ علیہ). He also wrote many books on Sufism and Islam. Among his students were Hazrat Ashraf Jahangir Semnani (رحمتہ اللہ علیہ)and Hazrat Mir Sayyid Ali Hamadani (رحمتہ اللہ علیہ).