Xiushui County (Chinese: 修水县; pinyin: Xiūshuǐ Xiàn) is a county in the northwest of Jiangxi Province, China, bordering the provinces of Hunan to the west and southwest and Hubei to the northwest.

It is the westernmost county-level division of the prefecture-level city of Jiujiang.

In 2019, Xiushui County achieved a gross regional product (GDP) of 24.7 billion yuan throughout the year Xiushui has a long history.

It was named Aihou in the Shang dynasty and Aiyi in the Spring and Autumn period.

In 1912 (the first year of the Republic of China), the name was changed to Ning County, and in 1914, it was renamed Xiushui County, which was named after Xiuhe river within the territory.