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Aquin was born in Montreal and graduated from the Université de Montréal in 1951. From 1951 to 1954, he studied at the Institut d'études politiques in Paris. On his return to Montreal worked for Radio-Canada from 1955 until 1959. From 1959 until 1964, he also worked as a screenwriter, director and film producer with the National Film Board of Canada.
From 1960 to 1968, Aquin was active in the movement for Quebec independence. He was an executive member of the first independentist political party, the Rassemblement pour l'indépendance nationale (1960–1969). In 1964, he announced that he was going "underground" to work for independence through terrorism; he was arrested shortly thereafter and detained for four months in a psychiatric hospital. It was there that he wrote his first novel, Prochain épisode (1965), the story of an imprisoned revolutionary. In December 1964, he was acquitted of illegal possession of a firearm.
Regarded as a classic of Canadian literature, Aquin's novel Next Episode (the English translation of Prochain épisode by Sheila Fischman), was chosen for the 2003 edition of CBC Radio's Canada Reads competition, where it was championed by journalist Denise Bombardier. It was the winning title. An earlier English translation by Penny Williams, keeping the French title, was published in 1967.
The self-destructive thoughts of the novel's narrator foreshadow Aquin's own death: On 15 March 1977, Aquin shot himself in the head. He left a suicide note claiming his death was a free and positive choice, stating, "I have lived intensely, and now it is over." A fuller understanding of Aquin's intense life can be gained from Jacques Godbout's biographical documentary, Deux épisodes dans la vie d'Hubert Aquin (1979) and from HA!: A Self-Murder Mystery (2003), an experiment in biography by Aquin's friend Gordon Sheppard.
The Université du Québec à Montréal (UQAM) named its main humanities building in his honour because he was the first director of the Département d'Études littéraires in 1969, a professor, and also because of his important novels and radio dramas.
- Prochain épisode (Next Episode) — 1965
- Trou de mémoire (Blackout) — 1968
- L'Antiphonaire (The Antiphonary) — 1969
- Point de fuite — 1971
- Neige noire (Hamlet's Twin) — 1974
- Blocs erratiques — 1977
- L'Invention de la mort — written in 1959, published in 1990
- Sheppard, Gordon, HA! A Self-Murder Mystery. (2003) Experimental biography centred on the suicide of Aquin and other notable suicides in literary history.
- Smart, Patricia, Hubert Aquin agent double, (1973).
- Legris, Renée, "Hubert Aquin et la radio. Une quête d'écriture (1954–1977)", Médiaspaul, (2004).
- Palumbo, Filippo, Hubert Aquin et la Gnose, PhD, Universite de Montreal (Canada), 2011, 349 pp., AAT NR74925; https://papyrus.bib.umontreal.ca/jspui/bitstream/1866/4817/2/Palumbo_Filippo_2010_these.pdf.
- Legris, Renée (2004). Hubert Aquin et la radio : une quête d'écriture, 1954-1977. Montréal: Médiaspaul. p. 51. ISBN 2894205872.
- "CBC Archives".
- Aquin, Hubert. "À Saint-Henri le cinq septembre" (Requires Adobe Flash). Documentary film (in French). National Film Board of Canada. Retrieved 21 May 2011.