John Rudolph Niernsee, Viennese-born American architect (died 1885)

John Rudolph Niernsee was an American architect. He served as the head architect for the Baltimore and Ohio Railroad. Rudolph also largely contributed to the design and construction of the South Carolina State House located in Columbia, South Carolina. Along with his partner, James Crawford Neilson, Rudolph established the standard for professional design and construction of public works projects within Baltimore and across different states in the United States.