Mohammad Moin, Iranian linguist and lexicographer (d. 1971)
Mohammad Moin (Persian: محمد معین, his surname could also be transliterated as Mo'in) (July 12, 1914, Rasht, Iran – July 4, 1971, Tehran, Iran) was a prominent Iranian scholar of Persian literature and Iranian Studies.

Mohamad Moin studied at the Higher Institute of Science in Tehran and obtained his BA in literature and philosophy in 1934. He subsequently went to Belgium and graduated in applied psychology, anthropology and cognitive science under Elmer Knowles. On returning to Iran he carried out his doctoral research under Ebrahim Pourdavoud at the University of Tehran, culminating in a thesis with the title "Mazdayasna and its Influence on Persian Literature" for which he received a PhD with honours in Persian literature and linguistics. He is the first doctoral graduate in Persian literature from the University of Tehran.

He was later appointed full professor at University of Tehran, from which position he was subsequently promoted as Distinguished Professor to the Chair of Literary Criticism and Research in Literary Texts at the same university. He is best known for his famous Mo'in Dictionary as well as his contributions to The Dehkhoda Dictionary, a work he did in collaboration with Ali-Akbar Dehkhoda himself.

Mo'in was President of the literature commission of the International Congress of Iranian Studies and Director of the Dehkhoda Dictionary Institute.

Mohammad Mo'in died in 1971 in Tehran. He is buried in Astaneh Ashrafiyeh, Gilan, Iran. His burial chamber was vandalized in 1981 by vigilantes, thought to be due to Mo'in's ties to the political elite of the Pahlavi Era.