Irving Peter Layton, OC (March 12, 1912 – January 4, 2006) was a Romanian-born Canadian poet. He was known for his "tell it like it is" style which won him a wide following but also made him enemies. As T. Jacobs notes in his biography (2001), Layton fought Puritanism throughout his life:

Layton's work had provided the bolt of lightning that was needed to split open the thin skin of conservatism and complacency in the poetry scene of the preceding century, allowing modern poetry to expose previously unseen richness and depth.

Irving Layton was born on March 12, 1912, as Israel Pincu Lazarovitch in Târgu Neamţ to Romanian Jewish parents, Moses and Klara (née Moscovitch) Lazarovitch. He migrated with his family to Montreal, Quebec in 1913, where they lived in the impoverished St. Urbain Street neighbourhood, later made famous by the novels of Mordecai Richler. There, Layton and his family (his father died when Irving was 13) faced daily struggles with, among others, Montreal's French Canadians, who were uncomfortable with the growing numbers of Jewish newcomers. Layton, however, identified himself not as an observant Jew but rather as a freethinker.

Layton graduated from Alexandra Elementary School and attended Baron Byng High School, where his life was changed when he was introduced to such poets as Tennyson, Walter Scott, Wordsworth, Byron, and Shelley; the novelists Jane Austen and George Eliot; the essayists Francis Bacon, Oliver Goldsmith, Samuel Johnson, and Jonathan Swift; and also Shakespeare and Darwin. He was befriended by David Lewis and became very interested in politics and social theory. He joined the Young People's Socialist League or YPSL (commonly pronounced "Yipsel"), which Lewis led. He began reading Karl Marx and Nietzsche. His activities in YPSL were deemed a threat to the high school administration, and he was asked to leave before graduating in 1930. It was Lewis who introduced Layton to A. M. Klein. Lewis asked Klein to be Layton's Latin tutor so he could pass the junior matriculation exams. Lewis gave him $10 to pay the fee for the exam and he passed. It was also during his time with Klein that he became interested in the sound of poetry.

Klein and I met once weekly at Fletcher's Field just across from the YHMA [sic] on Mt. Royal Avenue, and I vividly recall the first lesson: Virgil's Aeneid, Book II:I
...hearing Klein roll off the Virgilian hexameters in a beautiful orotund voice that rose above the traffic, I think it was then that I realized how lovely and very moving the sound of poetry could be. I must confess my Latin wasn't sufficient to appreciate the sense that Virgil was making with his marvelous hexameters, but Klein's zeal and enthusiasm, his forceful delivery, his very genuine love of language, of poetry, all came through to me at that time. And I think that was most fortunate for me. ...

Klein published Layton's first poem in The McGilliad, the underground campus journal he was editing at McGill University.

Despite Layton's limited educational opportunities, his lack of a high school diploma, and his limited finances, he enrolled in Macdonald College (McGill) in 1934 and received a Bachelor of Science degree in Agriculture.

While in college, he was well-known in artistic circles for his anti-bourgeois attitudes and his criticism of politics. He quickly found that his true interest was poetry, so he pursued a career as a poet, and soon became friends with the emerging young poets of his day, including fellow Canadian poets John Sutherland, Raymond Souster, and Louis Dudek. In the 1940s, Layton and his fellow Canadian poets rejected the older generation of poets, as well as critics Northrop Frye; their efforts helped define the tone of the post-war generation of poets in Canada. Essentially, they argued that English Canadian poets should set their own style, independent of British styles and influences, and should reflect the social realities of the day.