Mihailo Vojislavljević was a medieval Serbian king and the ruler of Dioclea (Duklja), from 1046 to 1081 initially as a Byzantine vassal holding the title of protospatharios, then after 1077 as nominally serving Pope Gregory VII, addressed as "King of the Slavs". He had alienated himself from the Byzantines when he supported a Bulgarian Uprising of Georgi Voyteh, after which he then sought to gain support in the West. In 1077 he received a royal insignia by Gregory VII in the aftermath of the Church schism of 1054.

The House of Vojislavljević was a Serbian medieval dynasty, named after archon Stefan Vojislav, who wrested the polities of Duklja, Travunia, Zahumlje, inner Serbia and Bosnia from the Byzantines in the mid-11th century. His successors, kings Mihailo I Vojislavljević and Constantine Bodin expanded and consolidated the state. During the 12th century, the main line of the Vojislavljević family was ousted by their cadet branch, the Vukanović. (which became the Nemanjić dynasty), in the late 12th century.