Yes, Denny's is open on Christmas Day! The restaurant offers a special Christmas menu, including dishes like the Festive Feast and the Christmas Breakfast Platter. You can also enjoy traditional holiday favorites like turkey and ham, as well as classic Denny's dishes like pancakes, burgers, and sandwiches. Denny's also has a festive atmosphere, with Christmas decorations and music playing in the background. It's the perfect place to celebrate Christmas with friends and family!