| John A. MacIsaac | |
| Birth Date: | August 1883 |
| Birth Place: | Broad Cove Banks, Nova Scotia |
| Death Place: | Antigonish, Nova Scotia |
| Office: | MLA for Antigonish |
| Term Start: | 1941 |
| Term End: | June 1, 1942 |
| Predecessor: | John L. McIsaac |
| Successor: | John Patrick Gorman |
| Party: | Liberal |
| Occupation: | businessman |
John A. MacIsaac (August 1883 – June 1, 1942) was a Canadian politician. He represented the electoral district of Antigonish in the Nova Scotia House of Assembly from 1941 to 1942. He was a member of the Nova Scotia Liberal Party.[1]
MacIsaac was born in 1883 at Broad Cove Banks, Inverness County, Nova Scotia.[2] He married Mary Catherine MacDonald in 1916.[2] MacIsaac entered provincial politics in the 1941 election, winning the Antigonish riding by over 1000 votes.[3] MacIsaac died in office on June 1, 1942.[2]