Ukiah can refer to:
- Ukiah, California, a city in the U.S. state of California
- Ukiah, Oregon, a city in the U.S. state of Oregon
- Ukiah Oregon, a fictional character in a series of science fiction books by Wen Spencer
- Ukiah Valley, a valley in Mendocino County, California
- Yuki language, a language spoken by the Yuki Indians of California, also known as the Ukiah language