John Laughlin MacIsaac (June 3, 1870 – March 24, 1941) was a Canadian physician and political figure in Nova Scotia.
He represented Antigonish County in the Nova Scotia House of Assembly from 1925 to 1941.
MacIsaac was a fellow of the American College of Physicians and Surgeons.
He practised in Antigonish and died in office there at the age of 70.
This article about a Liberal party Member of the Nova Scotia House of Assembly is a stub.