The Miracles of Saint Demetrius (Latin: Miracula Sancti Demetrii) is a 7th-century collection of homilies, written in Greek, accounting the miracles performed by the patron saint of Thessalonica, Saint Demetrius. It is a unique work for the history of the city and the Balkans in general, especially in relation to the Slavic invasions of the late 6th and 7th centuries, which are otherwise neglected by contemporary sources.