Unfortunately, many fast food restaurants are closed on Christmas Day. Some popular fast food chains that do remain open on Christmas Day include McDonald's, Burger King, KFC, Wendy's, and Chick-fil-A. However, it's best to check with your local store to see if it will be open on Christmas Day as some locations may have different hours or be closed altogether. Additionally, some restaurants may have limited menus on Christmas Day, so it's important to check ahead of time if you're looking for a specific item.