Yes, you can use a grill pan on a cooktop stove. However, there are a few things to keep in mind when doing so. First, make sure that the pan is compatible with your stovetop. Some grill pans are only meant to be used on certain types of stoves. Secondly, always use caution when cooking with a grill pan on a stovetop. The pan will get very hot and it is important to avoid any potential injuries. Finally, follow the manufacturer's instructions carefully to ensure proper use of the grill pan.