Gennaro Maria D'Afflitto OP (1618 – 1673) was an Italian Dominican friar and military engineer who worked under Philip IV and Charles II of Spain.

[1] He followed him in the campaign to recapture Orbetello and Porto Longone (1650) and later served as military engineer in the Spanish Army in Catalonia, Portugal and the Southern Netherlands.

[1] In 1663 the Supreme Council of War appointed him as professor of mathematics in the Real Academia de Matemáticas, Artillería y Fortificación of Madrid.

[3] Around 1647 D'Afflitto entered the service as military engineer to Philip IV of Spain natural son John Joseph of Austria, who was in Naples between 1647 and 1648 to suppress Masaniello revolt.

D'Afflitto participated in the campaign to recapture Orbetello and Porto Azzurro and followed Don Giovanni to the Netherlands and Catalonia, where he took part in the siege and bombardment of Tortosa.

[9] He left in manuscript Terra seu quadripartites orbis, Compendio della Sfera universale, and a number of poems and miscellaneous tracts on philosophical and theological topics.