The Prineville Reservoir is in the high desert hills of Central Oregon, Oregon, United States. The reservoir is on the Crooked River 14 miles (22.5 km) southeast of Prineville, and 29 miles (46.7 km) east of Bend. This reservoir is a popular retreat for most of Central Oregon. It is near the geographic center of Oregon. Prineville Reservoir State Park is managed by the Oregon Parks and Recreation Department.

The Crooked River is a tributary, 125 miles (201 km) long, of the Deschutes River in the U.S. state of Oregon. The river begins at the confluence of the South Fork Crooked River and Beaver Creek. Of the two tributaries, the South Fork Crooked River is the larger and is sometimes considered part of the Crooked River proper. A variant name of the South Fork Crooked River is simply "Crooked River". The Deschutes River flows north into the Columbia River.