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The Administrator of Ascension is the head of government and representative of the Governor of St Helena—who is ex-officio the governor of Ascension—on Ascension Island. The role of the Administrator includes that of chairing the territory's Island council which consists of seven elected members. The Administrator of Ascension is formally referred to as "His Honour" or "Her Honour."

As a part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha the head of state is Elizabeth II, with the governor of Saint Helena appointed by the British government to act as her local representative. However, as Ascension Island is over 700 miles (1,127 km) away from Saint Helena, an Administrator is appointed as the governor's representative on the Island. The first Administrator was appointed in 1942.

Commandants, 1815–1922

Resident-magistrates, 1922–1964

Administrators, 1964–present