The chief minister of the Australian Capital Territory is the head of government of the Australian Capital Territory (ACT). The leader of the party with the largest number of seats in the unicameral Australian Capital Territory Legislative Assembly usually takes on the role. Unlike other states and territories, the chief minister is not appointed by a governor or administrator, but elected directly by the Assembly. The chief minister is the rough equivalent of the state premiers, and has been a member of the National Cabinet since its creation in 2020. The chief minister previously also represented the ACT on the Council of Australian Governments (COAG). Since there are no local governments in the territory, the chief minister's role is also similar to that of the mayor of a local government area. The chief minister sits on the Council of Capital City Lord Mayors. The current chief minister is Andrew Barr of the Australian Labor Party (ALP), who was first elected by the Assembly on 11 December 2014 following the resignation of Katy Gallagher.

List of officeholders

Graphical timeline

Rank by time in office

This is a list of chief ministers of the Australian Capital Territory by time in office. The basis of the list is the inclusive number of days between dates.

Total time in office of political parties in Australian Capital Territory

Australian Capital Territory Assembly – days as of

Labor

Liberal