Mu'iz ad-Din ()is the name of:
Mu'izzuddīn Muḥammad Ibn Sām, known as Shahabuddin Muhammad Ghori (1149–1206), Sultan of the Ghorid dynasty (Afghanistan) Mu'izz ad-Din Mahmud (died 1241), Zengid Emir of Jazira Muiz ud din Bahram (died 1242), Muslim Turkic ruler, Sultan of Delhi Muiz ud din Qaiqabad (1286–1290), Muslim Turkic ruler, Sultan of Delhi Muhammad Mu'iz ud-din (died 1779), sultan of the Maldives Chowdhury Moyezuddin Biwshash (fl. c. 1886), powerful Muslim landlord (zamindar) in Bengal Sálim Moizuddin Abdul Ali, or Salim Ali (1896–1987), Indian ornithologist and naturalist Hassanal Bolkiah Mu'izzaddin Waddaulah (born 1946), Sultan and Yang Di-Pertuan of Brunei