Abu Hatim, Ahmad ibn Hamdan al-Razi (Persian: ابو حاتم احمد بن حمدان الرازی) was a Persian Ismaili philosopher of the 9th century, who died in 322 AH (935 CE). He was also the Da'i al-Mutlaq (chief missionary) of Ray and the leader of the Ismaili da'wah in Central Persia.
He was born in Rayy near modern Tehran. He was a contemporary of Muhammad ibn Zakariya al-Razi and engaged in debates with him.