Powdered sugar, also known as confectioners' or icing sugar, is typically wheat-free. It is made by grinding granulated sugar into a fine powder and mixing it with a small amount of cornstarch to prevent clumping. Cornstarch is naturally wheat-free, so powdered sugar does not contain wheat. Always read the labels to ensure that the powdered sugar is safe for your specific dietary needs. You can look for products labeled as gluten-free or certified gluten-free, as they are typically suitable for those with wheat allergies or sensitivities.