| Nelson Round Barn | |
| Location: | County Road J46 |
| Coordinates: | 40.7067°N -93.3456°W |
| Area: | less than one acre |
| Built: | 1912 |
| Added: | November 19, 1986 |
| Refnum: | 86003189 |
The Nelson Round Barn is a historic building located near Allerton in rural Wayne County, Iowa, United States. It was built in 1912, and it was originally used as a dairy barn.[1] The building is a true round barn that measures 50feet in diameter.[2] It features white vertical siding, an aerator, and a conical roof. The barn has been listed on the National Register of Historic Places since 1986.