Daniel Nelson House and Barn, also known as the Nelson Pioneer Farm and Museum, are historic buildings located north of Oskaloosa, Iowa, United States. Daniel and Margaret Nelson settled here in 1844, a year after this part of Iowa was opened to settlement by the U.S. Government. Their first home was a log structure, non-extant, located northeast of the present house. The present house is a two-story, brick structure with a gable roof. The wooden porches on the front and back of the house date from 1898 to 1900. The large barn measures 61 by 46 feet (19 by 14 m), and was built in 1856. It is composed of board and batten construction from oak that was milled on the site. It was used largely as a granary, rather than a shelter for farm animals. Three other buildings included in the historic