Yes, powdered sugar and icing sugar are the same. They are two different names for the same finely ground sugar product commonly used in baking and making various types of frosting and icing. Powdered sugar is made by grinding granulated sugar into a fine powder and then adding a small amount of cornstarch to prevent clumping. It is called "powdered sugar" in the United States and some other countries, while it is referred to as "icing sugar" in the United Kingdom and many other parts of the world.