Ibn al-Samʿānī (Arabic: إبن السمعاني, 1113–1166), full name Abū Saʿd ʿAbd al-Karīm ibn Abī Bakr Muḥammad ibn Abi ʾl-Muẓaffar Manṣūr al-Tamīmī al-Marwazī al-Shafiʿī al-Samʿānī, nicknamed Tāj al-Islām (Crown of Islam) and Qiwām al-Dīn (Support of the Faith), was an Arab Muslim biographer and historian.