Yes, flourless chocolate brownies are naturally gluten-free, as they do not contain any wheat flour. It's important to note that while flourless brownies are naturally gluten-free, it's still possible for them to come into contact with gluten during the production or preparation process. If you are following a strict gluten-free diet, it's always a good idea to check the labels of any ingredients you use and to be mindful of cross-contamination when preparing your food.