Sayyid Muhammad ibn Zayn al-Din Ahmad al-Hassani al-Baghdadi, commonly known as Muhammad Zayni al-Baghdadi (1735 - 1801) was an Ottoman Iraqi Muslim scholar, literary and poet.
He was born in Najaf into a Shia Muslim family and taught by his father and the great Shi'a scholars of Najaf, such as Mahdi Bahr al-Ulum.
His works includes a Diwan of poetry and some books in Tafsir and Arabic literary sciences.
He was a member of Ma'rakat al-Khamis (Battle of Thursday) a literary seminar.
Zayni was a salon holder, welcoming poets and writers on the holiday of each week, that made him a leading literary figure in the late 17th century in Najaf, growing capital of Twelver Shi'a Muslims.