Oxbow is an unincorporated community in Baker County, Oregon, United States. Oxbow is along Oregon Route 86 next to the Snake River near the Oxbow Dam on the Oregon-Idaho border, about 17 miles (27 km) northeast of Halfway. Oxbow is just south of the site of the former mining town of Copperfield. Although it is unincorporated, Oxbow has a post office with a ZIP code of 97840.
There was once a station named Oxbow on a portion the Oregon Short Line Railroad now inundated by Oxbow Reservoir. It was named for The Oxbow, a U-shaped bend in the Snake River named for the agricultural implement. The present-day community of Oxbow was established in the early 1960s near the former site of Copperfield during the building of the Oxbow Dam by the Idaho Power Company. Oxbow post office was established on May 1, 1965, after moving the office from Homestead six miles to the north. At one time, Oxbow had a school.