The following list consists of over one hundred new (and in one case corrected) attributions of authorship of anonymous, pseudonymous, or incompletely signed letters, articles, poems, obituaries, drawings, reviews, and staff notes appearing in the Gentleman’s Magazine (hereafter GM) during the years 1815–17, when John Nichols and his son John Bowyer Nichols co-edited the magazine and assumed the mantle of its fictitious conductor, “Sylvanus Urban.” It thus constitutes the latest instalment in my ongoing efforts to supplement my Attributions of Authorship in the Gentleman’s Magazine, 1731–1868: An Electronic Union List (Charlottesville, VA: Bibliographical Society of the University of Virginia, 2003), http://bsuva.org/bsuva/gm2 (accessed 22 March 2020).