The Iddings Block is a property in Grand Forks, North Dakota that was listed on the National Register of Historic Places in 1982. It was one of 13 new commercial business block buildings built in Grand Forks in 1892, and is one of just two surviving from the 1888-1892 era. During 1892 to approximately 1906-1909, it was the location of Iddings and Company, the largest bookstore and stationer in the state in that period. In 1981, it housed Ruettell's. It includes Early Commercial, other, and vernacular architecture. The listing is described in its North Dakota Cultural Resources Survey document.