The Arcadia Round Barn is a landmark and tourist attraction on historic U.S. Route 66 in Arcadia, Oklahoma, United States. It was built by local farmer William Harrison Odor in 1898 using native bur oak boards soaked while green and forced into the curves needed for the walls and roof rafters. A second level was incorporated for use as a community gathering place. The town of Arcadia developed and prospered with the arrival of the railroad and in the 1920s the newly commissioned Route 66 was aligned through the town, passing next to the Round Barn.