Ahmad ibn Muhammad Ardabili (Persian: احمد بن محمد اردبیلی) was a Shia Grand Ayatollah of jurisprudence. After the death of Zayn al-Din al-Juba'i al'Amili, he became the Marja' of the Twelver Shia in Najaf, Iraq. He is known by the titles of Mohaghegh and Muoghaddas.