John Landquist (born 3 December 1881 in Stockholm – dead 2 April 1974 (aged 92) in Danderyd) was a Swedish literary critic, literary scholar, writer and professor of pedagogy and psychology at Lund University 1936–46.When Landquist studied at Uppsala University, he was member of the student organization Les quatre diables together with Sven Lidman, Sigurd Agrell and Harald Brising. Landquist was engaged in Strindbergsfejden and released August Strindberg's works.