Laishui County (simplified Chinese: 涞水县; traditional Chinese: 淶水縣; pinyin: Láishuǐ Xiàn) is a county in central Hebei province, China, bordering the Municipality of Beijing to the north and in the basin of the Juma River. It is under the administration of the prefecture-level city of Baoding and contains its northernmost point; it has a population of 340,000 residing in an area of 1,666 km (643 sq mi). It is served by China National Highway 112 and G5 Beijing–Kunming Expressway.

There are 7 towns, 7 townships, and 1 ethnic township under the county's administration.

Towns:

• Laishui (涞水镇), Yi'an (义安镇), Shiting (石亭镇), Zhaogezhuang (赵各庄镇), Yongyang (永阳镇), Sanpo (三坡镇), Jiulong (九龙镇)

Townships:

• Longmen Township (龙门乡), Qizhongkou Township (其中口乡), Songgezhuang Township (宋各庄乡), Hujiazhuang Township (胡家庄乡), Mingyi Township (明义乡), Wangcun Township (王村乡), Dongwenshan Township (东文山乡), Loucun Manchu Ethnic Township (娄村满族乡)