吉列姆县（Gilliam County, Oregon）是位于美国俄勒冈州北部的一个县，北隔哥伦比亚河与华盛顿州相望。面积3,167平方公里。根据美国2000年人口普查，共有人口1,915。县治康登 (Condon)。

成立于1885年2月25日。县名是纪念在惠特曼事件后接管俄州的科内利乌斯·吉列姆 (Cornelius Gilliam)。

Gilliam County is a county located in the U.S. state of Oregon. As of the 2010 census, the population was 1,871, making it the third-least populous county in Oregon. The county seat is Condon. The county was established in 1885 and is named for Cornelius Gilliam, who commanded the forces of the provisional government of Oregon after the Whitman Massacre.