The National Cash Register Building, commonly referred to as the St. Johns Theater & Pub, was a building that was first erected in St. Louis, Missouri, for the Louisiana Purchase Exposition in 1904 and then moved to Portland, Oregon, the next year for the Lewis and Clark Centennial Exposition. It was moved a third and final time to the suburb of St. Johns, Oregon, which is now a part of Portland. It was given to the St. Johns Congregational Society by the NCR Corporation.