MacIsaac (February 10, 1878 – January 9, 1969) was a dairy farmer and political figure on Prince Edward Island.
He represented 1st Kings in the Legislative Assembly of Prince Edward Island from 1935 to 1943 as a Liberal.
He was born in Souris, Prince Edward Island, the son of Donald A.
MacIsaac and Annie Ford.
MacIsaac was a lieutenant in a Canadian artillery unit from 1898 to 1902.
In 1910, he married Mary Josephine McInnis.
He was an unsuccessful candidate for a seat in the provincial assembly in 1931 and was defeated when he ran for reelection in 1943.
MacIsaac died in the Souris Hospital at the age of 80.