Off the top of my head:
Yasar Kemal is Turkish, probably not available in ebook though
Romania: Bogdan Tiganov or for a nice 2-in-1 you could go for Herta Müller who IIRC was born in Romania but in a German-speaking community
Spain: Carlos Ruiz Zafón
Italy: Italo Calvino; Umberto Eco
I'll have a look through my stuff again and see if I can come up with a few more and something for Ukraine, Tunisia and Greece