Klamath may refer to:
Ethnic groups Klamath people, a Native American people of California and Oregon Klamath Tribes, a federally recognized group of tribes in Oregon Klamath language, spoken by the Klamath people
Places in the United States False Klamath, California, a coastal area along U.S. Route 101 Fort Klamath, a former military outpost in Oregon Fort Klamath, Oregon, a present-day unincorporated community near the former fort Klamath, California, a census-designated place Klamath, California, former name of Johnsons, California Klamath Basin, the region in Oregon and California drained by the Klamath River Klamath County, California Klamath County, Oregon Klamath Mountains, in California and Oregon Klamath National Forest Klamath River, in Oregon and California
Science and technology Klamath (microprocessor), a variant of the Pentium II microprocessor Klamath, a ferryboat that operated on San Francisco Bay Klamath (steamboat), a steamboat that operated on Lower Klamath Lake in the early 20th century , a U.S. Navy steamer Klamath (train), a Southern Pacific passenger train
Other uses Klamath Hardwoods, now Columbia Forest Products, an American hardwood manufacturer Klamath (album), a 2009 album by American musician Mark Eitzel
See also Klamath 5, or "555", a common prefix for fictitious telephone numbers Klamath coneflower, a species of genus Rudbeckia Klamath fawn lily, a species of genus Erythronium Klamath Lake sculpin, a fish species of genus Cottus Klamath trillium, or Pseudotrillium rivale, a flower species Klamath weed, or St. John's wort, a flowering plant of family Hypericaceae