Magnolia is a city in Harrison County, Iowa. The population was 183 at the 2010 census.
Harrison County was established in 1851 and organized on March 7, 1853. Abram Fletcher, Charles Wolcott and A. D. Jones were appointed by the Iowa General Assembly as Commissioners to organize the county and establish a county seat. They chose the location for Magnolia and gave it its name. The third building that was erected in the town for the county courthouse in 1873 still stands in the town, and is listed on the National Register of Historic Places.
The county seat was transferred to Logan from Magnolia in 1875