Huidong County (simplified Chinese: 惠东县; traditional Chinese: 惠東縣; pinyin: Huìdōng Xiàn; Jyutping: wai6 dung1 jyun6) is a county of southeastern Guangdong province, People's Republic of China, with some South China Sea coast in the south of the county. It is under the administration of Huizhou City.