Already covered (23 countries):
Afghanistan: The Kite Runner by Khaled Hosseini
Argentina: Garden of Forking Paths by Jorge Luis Borges
Austria: The golem by Gustav Meyrink
Belarus: "Чернобыльская молитва", Светлана Алексиевич
Brazil: books by Paulo Coelho
Colombia: One Hundred Years of Solitude by Gabriel García Márquez
Cuba: The Kingdom of this World by Alejo Carpentier
Denmark: a lot, for example Smilla’s Sense of Snow by Peter Høeg
France: a lot, including Antoine de Saint-Exupery, Émile Zola, Victor Hugo, Stendhal...
Germany: again a lot, including Heinrich Böll, Erich Maria Remarque...
Greece: a lot of ancient stuff, like The Odyssey
Iceland: sagas
Ireland: a lot, including Joyce's Ulysses and books in Irish
Italy: Божественная комедия by Dante Alighieri
Japan: I've read something by Murakami
Netherlands: again a lot, for example Hersenschimmen by J. Bernlef and Het dagboek van Anne Frank
Norway: A Doll's House by Henrik Ibsen
Poland: Одиночество в Сети by Януш Леон Вишневский
Russia: I'm Russian, so A LOT
Spain: Don Quixote by Miguel de Cervantes
Sweden: Фрекен Юлия by August Strindberg
UK: a lot, including Charles Dickens, Arthur Conan Doyle and Julian Barnes
US: a lot, including One Flew Over the Cuckoo's Nest by Ken Kesey
(less)Already covered (23 countries):
Afghanistan: The Kite Runner by Khaled Hosseini
Argentina:
(...more)