(Arabic, عبد الله بن أبي اسحاق الحضرمي), (died AD 735 / AH 117) an Arab grammarian and is the earliest known grammarian of the Arabic language. He compiled a prescriptive grammar by referring to the usage of the Bedouins, whose language was seen as especially pure (see also , ).
Two students of Abi Ishaq's were (died 149 H) and (died 154 H.). Al-Thaqafi seems to have had more prescriptive views while al-Ala's were more descriptive. Their differences have been suggested to lie at the core of the later division of Arabic grammar into the schools of Kufa and Basra.