The Wallowa Mountains are a mountain range located in the Columbia Plateau of northeastern Oregon in the United States. The range runs approximately 40 mi (64) northwest to southeast along in southwestern Wallowa County between the Blue Mountains to the west and the Snake River to the east. The range is sometimes considered to be an eastern spur of the Blue Mountains.

Much of the range is located in the Eagle Cap Wildnerness Area , as well as the Wallowa-Whitman National Forest . The range is drained by the Wallowa River, which flows in the valley along its northeastern side, as well as its tributaries, including the Minam River , which flows along the southwest side of the range.

The highest point in the range is Sacajawea Peak, with an elevation of 9838 ft (2999 m). Sacajawea is the 6th tallest mountain in Oregon and the tallest mountain in Oregon outside of the Cascade Range.