The choice for Canada is The Wars by Timothy Findley. It’s a great book but not one that was ever considered mandatory during my 30-year teaching career.
The Guardian newspaper had a feature this past fall on the same topic. Leading British authors were asked to pick international classics that should be on students’ bookshelves, but are often neglected by universities: https://www.theguardian.com/education/2016/nov/26/the-non-western-books-that-every-student-should-read. The only suggestion I’ve read is the Cairo trilogy by Naguib Mahfouz.
And on the topic of international reading, there are classics that have become associated with different countries as being one of the most important pieces of literature from the region. Check out this map of the world where each country is represented by a book that is seen as either the most well-known or important work to come from that country: https://www.bookstr.com/article/famous-books-make-up-this-map-of-the-world/3339?utm_campaign=705566_newsletter_172203&utm_medium=email&utm_source=The%20Reading%20Room%20&dm_i=2P56,F4F2,4M9UM2,1JXAI,1.