Gjon Gazuli, OP (Latin: Johannes Gasulus, Croatian: Ivan Gazulić)[a][b] was a Dominican friar, humanist scholar, astronomer and diplomat from the Republic of Ragusa of Albanian origin.
[5] Gazuli attended schools in Shkodër and Dubrovnik, and in 1430 he graduated from the University of Padua.
In 1432 he traveled to the Hungarian royal court where he attempted to persuade Sigismund I to support Albanian resistance against the Ottoman Empire.
Years later he was acting as a diplomat with the Italian principalities' courts, representing the interests of Skanderbeg and of the League of Lezhë.
His brother, Pal Gazuli (1405–1470), was the diplomat of Skanderbeg and of the League of Lezhë in Ragusa.