Klamath may also refer to the following places in the United States:
- Fort Klamath, a former military outpost in Oregon
- Fort Klamath, Oregon, a present-day unincorporated community near the former fort
- Klamath Basin, the region in Oregon and California drained by the Klamath River
- Klamath Basin National Wildlife Refuges Complex
- Klamath, California, a census-designated place
- Klamath, California, former name of Johnsons, California
- Klamath County, California
- Klamath County, Oregon
- Klamath Falls, Oregon, a city
- Klamath Falls Airport
- The Klamath Mountains of California and Oregon
- Klamath National Forest in northern California
- Klamath River
- Klamath-Siskiyou forests, a forest ecoregion
- Lower Klamath Lake, Siskiyou County, California
- Lower Klamath National Wildlife Refuge
- Upper Klamath Lake, southern Oregon
Klamath can also refer to
- Klamath, the 350nm first version of the Intel Pentium II CPU
- Klamath, a town in Fallout 2, based on Klamath Falls, Oregon
- KLamath-5, a fake telephone exchange for television, see 555 telephone number
- Klamath coneflower, a species of genus Rudbeckia
- Klamath fawn lily, a species of genus Erythronium
- Klamath Hardwoods, the former name of the Columbia Forest Products
- Klamath Lake sculpin (Cottus princeps) or Cottus klamathensis, two species of genus Cottus
- Klamath Reclamation Project, an irrigation project in the Klamath Basin
- Klamath Tribes, the federally recognized tribal entity of the Klamath, Modoc and Yahooskin
- Klamath trillium, a species of genus Trillium
- Klamath weed, another name for St John's wort
- USS Klamath (1865), a U.S. Navy steamer
- Klamath, a 2009 album by American musician Mark Eitzel