Angus McDonald (1727 – August 19, 1778) was a prominent Scottish American military officer, frontiersman, sheriff and landowner in Virginia.
During the Jacobite rising of 1745, McDonald fought as a lieutenant under the command of Charles Edward Stuart in the Battle of Culloden, after which, he was "attainted of treason." He fled Scotland, departing from Inverness for the Colony of Virginia in 1746 at the age of 18.
McDonald moved west into Virginia's interior and entered the military service of the colonial government under Lieutenant Governor Robert Dinwiddie, receiving the rank of captain. McDonald served in the French and Indian War under General John Forbes in which he was in command of a company of Scottish Highlanders. Following the war, McDonald retired with the rank of captain in 1763.
In 1765, McDonald returned to military service when he was commissioned by Thomas Fairfax, 6th Lord Fairfax of Cameron as a major in command of the Frederick County militia. Lord Fairfax also appointed McDonald as an attorney and land agent for his Northern Neck Proprietary.
Governor John Murray, 4th Earl of Dunmore commissioned McDonald in 1774 as a ranking military officer of an expedition (known as "McDonald's Expedition") to promptly organize and recruit settlers west of the Allegheny Mountains to defend settlements from Native American attacks. McDonald completed the expedition, which met its goal of temporarily relieving western Virginia frontier settlements from attack.
McDonald received a personal letter from General George Washington in 1777 appointing him a lieutenant colonel in a battalion of Thruston's Additional Continental Regiment under the command of Colonel Charles Mynn Thruston. Despite his loyalty to the American Revolutionary cause, McDonald refused Washington's appointment. McDonald was later appointed by Washington to serve as a lieutenant colonel in command of Virginia revolutionary militia forces during the American Revolutionary War. He also served on various revolutionary committees throughout the war.