惠特曼县（Whitman County, Washington）是美国华盛顿州东部的一个县，东邻爱达荷州。面积5,640平方公里。根据美国2000年人口普查，共有人口40,740人。县治科尔法克斯（Colfax）。

成立于1871年11月29日。县名纪念在1847年被卡尤塞人杀死的长老会传教士马库斯·惠特曼（Marcus Whitman）。

Whitman County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 44,776. The county seat is Colfax, and its largest city is Pullman. The county was formed out of Stevens County on November 29, 1871. It is named after Marcus Whitman, a Presbyterian missionary who, with his wife Narcissa, was killed in 1847 by members of the Cayuse tribe.