太平洋县（Pacific County, Washington）是美国华盛顿州西南角的一个县，西临太平洋 (这也是县名的由来)。南隔哥伦比亚河与俄勒冈州相望。面积3,169平方公里。根据美国2000年人口普查，共有人口20,984人。县治南本德 (South Bend)。

成立于1851年2月4日。

Pacific County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 20,920. Its county seat is South Bend, and its largest city is Raymond. The county was formed by the government of Oregon Territory on February 4, 1851 and is named for the Pacific Ocean.