I'd like to read a fiction book written by an Italian similar to All Quiet on the Western Front since I recently became very interested in WW1 and the Italian role in it.
I highly suggest Lussu's "Un anno sull'altipiano", there is also a film inspired by the book "Uomini Contro". I think it was translated in English with the title "A soldier on the southern front".
Right now I don't remember other books, will update if I do.
This might be completely missing the point, but "A Farewell to Arms" takes place on the Italian Front during WW1. However, it is written by Hemingway (an American), and the protagonist is an American.
If you're looking for book suggestions, one of my all time favorites is "The Sergeant in the Snow", although that's about the Second World War, not the first.