Central Wisconsin State Fair Round Barn
- Also Known As: Show and Sale Barn
- Address: 513 E 17th St
- Vicinity: Vine Ave
Located at Marshfield Fairgrounds Park and reputed to be the World's Largest Round Barn. Built in 1916, this impressive edifice measures 150 feet in diameter and 70 feet high. The structure appears to be built with only a few supporting beams, visible beneath the cupola.