Mata'afa Iosefo was a Paramount Chief of Samoa who was one of the three rival candidates for the kingship of Samoa during colonialism. He was also referred to as Tupua Malietoa To'oa Mata'afa Iosefo. He was crowned the King of Samoa on 15 November 1898.

A paramount chief is the English-language designation for the highest-level political leader in a regional or local polity or country administered politically with a chief-based system. This term is used occasionally in anthropological and archaeological theory to refer to the rulers of multiple chiefdoms or the rulers of exceptionally powerful chiefdoms that have subordinated others. Paramount chiefs were identified by English-speakers as existing in Native American confederacies and regional chiefdoms, such as the Powhatan Confederacy and Piscataway Native Americans encountered by European colonists in the Chesapeake Bay region of North America.