Miguel Casiri (Arabic: الاب مخايل الغزيري; Mikhael Ghaziri) (1710–1791) was a learned Maronite and Orientalist.
He was successively appointed a member of the Royal Academy of History, interpreter of oriental languages to the king, and joint-librarian at the Escorial.
Casiri published a work entitled Bibliotheca Arabico-Hispana Escurialensis (2 vols., Madrid, 1760–1770).
The second volume gives an account of a large collection of geographical and historical manuscripts, which contain valuable information regarding the wars between the Moors and the Christians in Spain.
Casiri's work is not yet obsolete, but a more scientific system is adopted in Hartwig Derenbourg's incomplete treatise, Les Manuscrits arabes de l'Escorial (Paris, 1884).