The Lord Lieutenant is the monarch's representative in the English county of Dorset.
The office of the Lord Lieutenant was created during the reign of Henry VIII (1509–1547), taking over the military duties of the Sheriff of Dorset and control of the military forces of the Crown. From 1569, there was provision for the appointment of Deputy Lieutenants, and in 1662 the Lord-Lieutenant was given entire control of the militia. The Forces Act of 1871 transferred this function back to the Crown, and in 1921, the office lost its power to call upon men of the county to fight in case of need.