The John A. Green Estate (also known as the Green-Nissen Estate) is a historic property in Stone City, Iowa, United States. The estate covers 200 acres of land. The buildings were constructed of Anamosa Limestone quarried from John Green's own local business. The estate was individually listed as a historic district on the U.S. National Register of Historic Places in 1978. It was included as a contributing property in the Stone City Historic District in 2008.