Munro was born Alice Ann Laidlaw in Wingham, Ontario. Her father, Robert Eric Laidlaw, was a fox and mink farmer,[11] and later turned to turkey farming.[12] Her mother, Anne Clarke Laidlaw (née Chamney), was a schoolteacher. She is of Irish and Scottish descent; her father is a descendant of James Hogg, the Ettrick Shepherd.[13]
Munro began writing as a teenager, publishing her first story, "The Dimensions of a Shadow", in 1950 while studying English and journalism at the University of Western Ontario on a two-year scholarship.[14][15] During this period she worked as a waitress, a tobacco picker, and a library clerk. In 1951, she left the university, where she had been majoring in English since 1949, to marry fellow student James Munro. They moved to Dundarave, West Vancouver, for James's job in a department store. In 1963, the couple moved to Victoria, where they opened Munro's Books, which still operates.