Doon is a city in Lyon County, Iowa, United States, along the Rock River. The population was 533 at the 2000 census. The BNSF, or Burlington, Northern & Santa Fe Railway, passes through Doon.
Located on a plateau on the eastern bank of the Rock River, the city was named after the River Doon, made famous as the subject of Robert Burns' poem, Ye Banks and Braes o' Bonnie Doon. Founded by G. W. Bowers and A. H. Davison on September 6, 1889, the railway town was connected first by the Rock Valley Railway, followed by the Iowa & Dakota Railroad. The city was incorporated on March 8, 1892.
Doon is located at 43°16′43″N 96°13′55″W / 43.27861°N 96.23194°W / 43.27861; -96.23194 (43.278727, -96.231922).