Augustine Colin Macdonald (June 30, 1837 – July 16, 1919) was a Canadian merchant and political figure.

Macdonald served as the tenth Lieutenant Governor of Prince Edward Island from 1915 to 1919.

He was born in Panmure Island, the son of Hugh Macdonald, a Scottish immigrant, and was educated in Georgetown and Charlottetown.

He represented 3rd Kings in the Legislative Assembly of Prince Edward Island from 1870 to 1873.

As a result of Prince Edward Island joining Confederation 1 July 1873 Mr. Robertson was declared not duly elected on the grounds that he was a member of the Prince Edward Island Legislative Assembly at the time of the election.