Many restaurants are open on Christmas Day, though the number may vary depending on the location and type of restaurant. Some popular chain restaurants like McDonald's, Denny's, and IHOP are usually open 24 hours a day and may have limited holiday hours. Other restaurants that may be open on Christmas Day include Chinese and Japanese restaurants, as well as some independent or family-owned restaurants that offer specialized holiday menus. It's always a good idea to call ahead and confirm holiday hours before visiting a restaurant on Christmas Day.