Sayyid ʿAbdullāh bin Shaykh al-ʿAydarūs (Arabic: عبد الله بن شيج العيدروس‎, died 1609) was a Hadhrami religious leader who lived in the 16th century and a descendant of Abu Bakr al-ʿAydarūs, a prominent saint who started the al-ʿAydarūs branch of the Bā ʿAlawiyyah clan. ʿAbdullāh's son Zayn al-ʿAbidin also became a religious leader and migrated to Johor, where he married Tun Kaishi, the daughter of Tun Jenal, the Bendahara of Sekudai and took up the Malay name of "Tun Dagang" while staying with the Bendahara's family.