Yes, you can eat Parmesan rind. The rind is a natural, protective layer that forms on the outside of the cheese wheel as it ages. It is edible, though it can be very hard and tough to chew. Many people use Parmesan rinds to add rich flavor to soups, broths, sauces, and risotto by simmering the rind in the dish and then removing it before serving. Eating the rind directly is safe, but because of its tough texture, it is often more enjoyable when cooked to release its flavor. As long as the rind is not coated with inedible materials like wax or cloth, it is safe to consume either raw or cooked.