Columbia Basin

Columbia Basin may refer to:
 * Columbia Plateau, the geographic region in the Pacific Northwest commonly referred to as the Columbia Basin
 * Columbia Plateau (ecoregion), an ecoregion in the U.S. states of Oregon and Washington
 * Columbia River drainage basin, a drainage basin covering parts of U.S. and Canada
 * Columbia River Basalt Group, a set of rock layers that underlies the Columbia Plateau, above.