Moinuddin, (Arabic: معین الدین ) is a male Muslim name composed of the elements Muin, meaning helper and ad-Din, meaning of the faith. It may refer to
Mu'in ad-Din Unur (died 1149), ruler of Damascus
Khwaja Moinuddin Chishti (1141–1230), Sufi saint
The Pervâne Mu‘in al-Din Suleyman (died 1277), politician in Anatolia
Mo'in al-Din Junayd ibn Mahmud ibn Muhammad Baghnovi Shirazi, or just Junayd Shirazi (fl. 1389), Persian Sufi poet
Moinuddin Chishti (Khuldabad) (17th century), Sufi saint
Muhammad Mueenuddeen I (died 1835), sultan of the Maldives
Muhammad Mueenuddeen II (fl. 1887), sultan of the Maldives
Moinuddin Haider (born 1942), Pakistan army General
Moinuddin Aqeel (born 1946), Pakistani author, critic and linguist
Mirza Ghulam Moinuddin Muhammad, Javaid Jah Bahadur (born 1946), Indian descendant of the Mughal emperors
Moinuddin (cricketer) (born 1987), Pakistani cricketer
