Instructor: How to say, "Merry Christmas" in Italian. Buon natale! Merry Christmas. Buon natale! Now you try. To say, "Happy holidays" I'd stick with Buon natale because Italians are pretty Catholic but in general you can say, "Buone vacanze!" Happy holidays. Buone vacanze! Now you try. And that's how you say, "Merry Christmas" in Italian.