基萨普县（英语：Kitsap County）是位于美国华盛顿州基沙普半岛北部、普吉特湾西岸的一个县。根据美国2010年人口普查，共有人口251,133人。县治奥乍得港，最大城市布雷默顿。该郡于于1857年1月16日从金县和杰佛逊县分出，县名来自苏跨米西人的基沙普酋长。该郡原本叫斯劳特郡（英语：Slaughter County）。

基萨普县包含布雷默顿-银谷都会统计区、西雅图都会区的一部分。

Kitsap County is located in the U.S. state of Washington. As of the 2010 census, its population was 251,133. Its county seat is Port Orchard, and its largest city is Bremerton. The county was formed out of King County, Washington, and Jefferson County, Washington on January 16, 1857 and is named for Chief Kitsap of the Suquamish tribe. Originally named Slaughter County, it was soon renamed.