The Bechler River is a remote major river flowing southwest entirely within the confines of Yellowstone National Park to it confluence with the Fall River in the southwest section of the park. The river was named by Frank Bradley, a member of the 1872 Hayden Geological Survey for Gustavus R. Bechler, the chief topographer on the survey. Henry Gannett also a member of the survey claimed that Belcher discovered the river, but trapper Osborne Russell explored the area in 1830.
Although the Bechler River is in the remote Cascade Corner of the park, it is popular with local anglers. It holds mostly Cutthroat trout and a few Rainbow trout. Because of spring runoff, the river is generally not fishable until mid-July and access is difficult. The river is paralleled by the Bechler River Trail which starts at Cave Falls on the park's south boundary or spurs off the Shoshone Lake trail.