Operation Fath-ol-Mobin (Persian: عملیات فتح‌المبین‎, a Quranic phrase meaning "Undeniable Victory" or "Manifest Victory") was a major Iranian military operation conducted during the Iran–Iraq War, in March 1982. The operation was led by Lt. General Ali Sayad Shirazi, and was conducted in four phases.

Some believe that this operation was the turning point in the war and that it led to the eviction of Iraqi troops from Khuzestan. Others (including Efraim Karsh) believe it was actually the operation working in tandem with others which led to the expulsion of Iraqi troops from southern Iran. He believes that in fact, Operation Beit ol-Moqaddas, which lasted from April to May 1982, had the greatest effect, because the Iranians were able to liberate the strategically important city of Khorramshahr.

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