Angus Macdonell of Collachie (died October 8, 1804) was a lawyer and political figure in Upper Canada. He was born in Inverness-shire, Scotland, the son of and brother of Alexander Macdonell of Collachie, and came to the estate of William Johnson in the Mohawk Valley of New York in 1773 as part of a large emigration by members of the MacDonell clan. He left that area at the beginning of the American Revolution and was educated in Montreal and Quebec City.