Luonan County (, alternatively ) is a county under the administration of Shangluo city, in the east of Shaanxi province, China, bordering Henan province to the east. It has an area of and a population of 450,000 as of 2004. Luonan is at the source of the Luo River. It is 108 kilometers away from Xi'an, the capital of Shaanxi province. Luonan has 14 towns. Its walnut production ranks first in China. Its gold production ranks third in Shaanxi. Its average temperature is . More than 66.7% of Luonan is covered in forests.
The name Luonan means "south of Luo", referencing the Luo River. It went through many name changes until the final one under the Emperor Tianqi.
Luonan County has 1 subdistrict and 9 towns.
Luonan tofu (æ´ÂÃ¥ÂÂè±Âè Â), a regional variant of tofu, is made from the pollution-free spring water of the Luo River and high-quality soybeans, resulting in its signature firmness and smoothness. It was once selected by Emperor Qianlong of the Qing Dynasty as a royal tribute.
China National Highway 344 passes through Luonan County.