The Baghdad Manifesto was a polemical tract issued in 1011 on behalf of the Abbasid caliph al-Qadir against the rival Isma'ili Fatimid Caliphate.

The assembly issued a manifesto denouncing the Fatimids' claims of descent from Ali and the Ahl al-Bayt (the family of Muhammad) as false, and thus challenge the foundation of the Fatimid dynasty's claims to leadership in the Islamic world.

Based on the work of the earlier anti-Fatimid polemicists Ibn Rizam and Akhu Muhsin, the manifesto instead put forth an alternative genealogy of descent from a certain Daysan ibn Sa'id. The document was ordered read in mosques throughout the Abbasid territories, and al-Qadir commissioned a number of theologians to compose further anti-Fatimid tracts