The Governor of Saint Helena is the representative of the British monarch in the United Kingdom's overseas territory of Saint Helena, Ascension and Tristan da Cunha. The governor is appointed by the monarch on the advice of the British government.
The role of the governor is to act as the de facto head of state as well as the de jure head of government and commander-in-chief of the territory, which consists of the islands of Saint Helena and Ascension and the group of islands of Tristan da Cunha. His or her responsibilities include internal security, external affairs, the administration of justice, finance, shipping, and employment and disciplinary action in respect of any public officer. The governor is represented by resident island Administrators, also appointed by the British Government, one on both Ascension Island and Tristan da Cunha. He or she also appoints Saint Helena's Executive Council, and, with some exceptions, is bound to seek and act in accordance with their advice.
The governor has his/her own flag in Saint Helena, the Union Flag defaced with the territory's coat of arms. The official residence, Plantation House, is located near the capital Jamestown, and the Governor's office is located within The Castle, along with the office of the Chief Secretary, who runs the day-to-day administrative part of the government.
Before 2009 the territory was known as "Saint Helena", of which Ascension and Tristan da Cuhna were dependencies. A new constitution which came into force in 2009 changed the name of the territory to "Saint Helena, Ascension and Tristan da Cunha"; however, the governor's title remained as the "Governor of Saint Helena". The Governor of Saint Helena nonetheless is the British monarch's representative across the territory.