Susan Harrison (1948 – 14 April 2013) was a Canadian writer and artist who published under the name A. S. A. Harrison. She lived in Toronto and was married to visual artist John Massey.
Harrison made a name for herself with performance art in the late 1960s, collaborating with Margaret Dragu. She worked as a typesetter for Toronto publications, and published several works of non-fiction.
Her first novel, the psychological thriller The Silent Wife, was published in June 2013 to critical acclaim. The book, telling the story of the slow murderous disintegration of a marriage, belongs to the subgenre known as Domestic Noir. Shortly before the novel's publication, Harrison died of cancer, aged 65.