Isabel Ecclestone Mackay (née MacPherson) (November 25, 1875 – August 15, 1928) was a Canadian novelist and poet.

Born in Woodstock, Ontario, she was the daughter of Donald McLeod MacPherson, an early Scottish settler of Oxford County, and Priscilla Ecclestone of England.

[4] The couple would remain in Vancouver until their deaths, with Mackay making her mark as a prominent member of the literary community.

Mackay was the founder of the British Columbia chapter of the Canadian Women's Press Club, serving as its vice-president in 1914 and, subsequently, as its president 1916.

[3] In 1926, her play "Treasure" won the open Canadian Imperial Order of the Daughters of the Empire contest.