Thief Valley Reservoir is a large reservoir on the Powder River in Eastern Oregon, United States. Primarily used for irrigation purposes, it lies at an elevation of approximately , covers an area of , and impounds . It provides good angling opportunities for rainbow trout in years of high water.

The reservoir was created in 1932 by the Thief Valley Dam, a project of the United States Bureau of Reclamation. The dam is a concrete-slab-and-buttress Ambursen structure, high and long. The dam was designed by Frank A. Banks.The United Press. Builder of Grand Coulee To Retire and Live Near It. The New York Times, September 12, 1950.

See also List of lakes in Oregon

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