"Unnamed Restaurant" is not an official name.
Unnamed Restaurant
Location Elwood City
Type Restaurant
Sells Food
First appearance D.W., the Picky Eater

The unnamed restaurant is a fancy restaurant that Arthur's family went for dinner, where D.W. ends up splattering her salad onto the waiter after learning that it contained spinach instead of lettuce. This prompted the waiter to quit working at this restaurant.