Al-Mustansir Billah III

ʿAbbās Shāh (Arabic: عباس شاه; died August 1498), also known as Gharīb Mīrzā (Arabic: غريب ميرزا) and with the regnal name of al-Mustanṣir Billāh III (Arabic: المستنصر بالله الثالث), was the 34th imam of the Qasim-Shahi branch of the Nizari Isma'ili community.

He succeeded his father Abd al-Salam Shah upon the latter's death in 1493–4, at Anjudan (Iran). According to oral Nizari tradition, Abbas Shah himself died in 1496–7, but the inscription in his mausoleum gives the date as August 1498. According to Nizari tradition, he was succeeded by his son Abu Dharr Ali, known as Nur al-Din.

• Daftary, Farhad (2007). The Ismāʿı̄lı̄s: Their History and Doctrines (Second ed.). Cambridge: Cambridge University Press. ISBN 978-0-521-61636-2.
• Virani, Shafique N. The Ismailis in the Middle Ages. A History of Survival, A Search for Salvation. Oxford and New York: Oxford University Press. ISBN 978-0-19-531173-0.