Owyhee or Owhyhee is an older English spelling of Hawaiʻi, used in the late 18th and early 19th centuries. It is found in the names of certain locations in the American part of the Pacific Northwest, which were explored and mapped by expeditions whose members included native Hawaiians:

Owyhee, Nevada, a community in north-central Nevada
Owyhee County, Idaho, the southwesternmost county of Idaho
Owyhee River, a river in Idaho, Nevada, and Oregon
Owyhee Dam, a dam on the river
Lake Owyhee, a lake in Oregon
Owyhee Desert, a desert in Nevada and Idaho
Owyhee Mountains, a mountain range in Idaho and Oregon