Oregon Route 454 (OR 454) is an Oregon state highway running from OR 452 near Adrian to Peckham Road on the Idaho state line near Adrian. OR 454 is known as the Adrian-Caldwell Highway No. 454 (see Oregon highways and routes). It is 5.09 miles (8.19 km) long and runs east–west, entirely within Malheur County, including 0.70 miles (1.13 km) along the Idaho state line. OR 454 was established in 2003 as part of Oregon's project to assign route numbers to highways that previously were not assigned, and, as of July 2018, was unsigned.