Ruyuan (postal: Yuyuan; Chinese: 乳源; pinyin: Rǔyuán; Jyutping: jyu5 jyun4 jyun6), officially Ruyuan Yao Autonomous County, is a county of northern Guangdong province, China, with a small border with Hunan to the northwest. It is under the administration of Shaoguan City.