Angus MacIsaac (1842 – June 12, 1902) was a Canadian lawyer, judge and political figure in Nova Scotia. He represented Antigonish in the House of Commons of Canada as a Liberal member from 1873 to 1885. He was born in Antigonish, Nova Scotia in 1842, the son of Donald MacIsaac and Catherine MacGillivray, and studied at Saint Francis Xavier College. McIsaac served as inspector of schools for Antigonish County. He articled in law with William Joseph Croke and Daniel MacDonald and was called to the bar in 1871. He practised law in Antigonish. In 1882, he married Mary Power.