Alphonse Roersch (1870–1951) was a Belgian philologist, professor at the University of Ghent.
He took a particular interest in Latin Humanists, publishing studies of Joannes Loensis (van Loo) and of Nicolas Cleynaerts, and of the history of classical philology in Belgium.
[2] All the articles on humanists published in the Biographie Nationale de Belgique between 1894 and 1938 were his work.
In 1913, after Ferdinand van der Haeghen's death, Roersch and Paul Bergmans jointly took over the editorship of the latter project.
[2] In 1935, he succeeded Henri Pirenne as chair of the board of the Royal Library of Belgium.