1909–1949: A Modern English Grammar on Historical Principles (in seven volumes; the title should be understood as 'A grammar of Modern English') originally published by Carl Winter, Heidelberg, later vols. by Ejnar Munksgard, Copenhagen and George Allen & Unwin, London (ISBN 0-06-493318-0) (Vols. 5–7, issued without series title, have imprint: Copenhagen, E. Munksgaard, 1940–49; Imprint varies: Pt.5–6: London: Allen & Unwin; pt.7: Copenhagen: Munksgaard, London: Allen & Unwin.)
1938: En sprogmands levned, Copenhagen, Jespersen's autobiography
1993. A literary miscellany: proceedings of the Otto Jespersen Symposium April 29–30, edited by Jørgen Erik Nielsen and Arne Zettersten 1994
1995: A Linguist's Life: an English translation of Otto Jespersen's autobiography, edited by Arne Juul, Hans Frede Nielsen and Jørgen Erik Nielsen, Odense (ISBN 87-7838-132-0)