It depends. While most enameled-cast iron-type ovens can be put in the dishwasher, it may not work for you. They tend to take up much more space than normal, so hand washing them might prove easier. As the soap and water can strip the seasoning from non-enameled (or raw) cast iron, it is not recommended to put them in the dishwasher. Here's a guide on how to properly care for raw iron.