Topaz Ranch Estates is a census-designated place (CDP) in Douglas County, Nevada, United States. The population was 1,501 at the 2010 census.
Topaz Ranch Estates is located in southern Douglas County, along Nevada State Route 208. It is 8 miles (13 km) east to Wellington and 3 miles (5 km) west to U.S. Route 395 at Holbrook Junction.
According to the United States Census Bureau, the Topaz Ranch Estates CDP has an area of 14.4 square miles (37.3 km2), all land.