Gilliam may refer to:
Places Gilliam County, Oregon, on the Columbia River Plateau Gilliam, Louisiana, a village Gilliam, Missouri, a city Gilliam, West Virginia, an unincorporated community
Other uses Gilliam (surname) USS Gilliam (APA-57), a US Navy attack transport ship Gilliam II, a fictional computer system in the manga and anime series Outlaw Star Gilliam Candy Company