Augustine Colin Macdonald (June 30, 1837 – July 16, 1919) was a Canadian merchant and political figure. He represented King's County and later King's in the House of Commons of Canada from 1873 to 1874, from 1878 to 1882, from 1883 to 1887 and from 1891 to 1900 as a Liberal-Conservative member. Macdonald served as the tenth Lieutenant Governor of Prince Edward Island from 1915 to 1919. His brother Andrew Archibald served in the Senate of Canada and was also a Lieutenant Governor for the province and his brother Archibald John was a long-time member of the provincial assembly.