| Erza McKenzie Round Barn | |
| Coordinates: | 42.6072°N -91.9353°W |
| Area: | less than one acre |
| Built: | 1922 |
| Builder: | Erza McKenzie |
| Added: | June 30, 1986 |
| Refnum: | 86001419 |
The Erza McKenzie Round Barn is a historic building located near Hazleton in rural Buchanan County, Iowa, United States. It was built in 1922 by Erza McKenzie for a dairy barn.[1] The building is a true round barn that measures 70feet in diameter.[2] The barn is constructed of clay tile and features small cupolas on the west, southwest and south sides of the structure. The building features a two-pitch roof and a central silo.[2] It has been listed on the National Register of Historic Places since 1986.