The Nineteenth Century was a British monthly literary magazine founded in 1877 by Sir James Knowles. Many of the early contributors to The Nineteenth Century were members of the Metaphysical Society. The journal was intended to publish debate by leading intellectuals.
In 1901, the title was changed to The Nineteenth Century and After. In October 1933, the magazine ran a review of H. G. Wells' work by Gerald Heard. Its title was subsequently changed again to The Twentieth Century in 1951. It was published until 1972. The magazine notably asserted, shortly before the outbreak of World War I in 1914, that, "The only court in which nations' issues can and will be tried is the court of God, which is war."