Yes, you can use an iron without water, but it may not work as effectively for some fabrics. The purpose of using water in iron is to create steam, which helps to relax the fabric fibers and remove wrinkles. If you use an iron without water, you will not be able to generate steam, which may make it harder to remove wrinkles and achieve a smooth finish. However, some irons are designed to work as dry irons, which means they do not require water and can still provide effective ironing results.