John Fadrique

John Fadrique (Catalan Joan Frederic d'Aragó; died 1366) was a Catalan nobleman in Frankish Greece. His father Alfonso Fadrique, vicar general of Athens and Neopatras, was the illegitimate son of Frederick II of Sicily, and his mother Marulla was the daughter and heiress of Boniface of Verona, a triarch of Euboea.

John is attested in 1350 as lord of the islands of Aegina and Salamis. His brothers held fiefs across the Catalan duchies, and his sister Simona married George II Ghisi.