'Abdullāh ibn 'Ibādh al-Tamimi (Arabic: عبدالله بن اباض التميمي, d. 708) was a Tabi'i, a jurist and one of the best students of Ibn Abbas, who narrated hadiths from Aisha and a large number of the Sahaba who witnessed the Battle of Badr. He was an imam in tafsir and Hadith and was one of the most significant figures of the Ibadi denomination of Islam.
Abdullah ibn Ibadh belongs to the tribe of Bani Murra who are descendants of Murra ibn Ubayd ibn Tamim, and thus he belongs to the tribe of Bani Tamim, one of the largest in the Arabian peninsula.
Ibn Ibadh grew up during the reign of Muawiyah I, the first ruler of the Umayyad Caliphate, and died during the reign of Abd al-Malik ibn Marwan.
The Ibadi school of thought is attributed to ibn Ibadh, although there is some recent research that qualifies this attribution.