Ruyang County (simplified Chinese: 汝阳县; traditional Chinese: 汝陽縣; pinyin: Rǔyáng Xiàn) is a county in the west of Henan province, China, under the jurisdiction of the prefecture-level city of Luoyang.

Ruyang County has been the site of several major discoveries of fossilized dinosaur bones, including Huanghetitan ruyangensis, which was first described in 2007.

As 2012, this county is divided to 4 towns and 9 townships.

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