Books in Browsing: History - Medieval/The Middle Ages (sorted alphabetically)
- Mont-Saint-Michel and Chartres Henry Adams
- Morien: A Metrical Romance Rendered into English Prose from the Mediæval Dutch Jessie L. Weston
- Morte Darthur Sir Thomas Malory
- Mysterious Stranger: A Romance Mark Twain
- Normans in European history Charles Homer Haskins
- Norse mythology; or, The religion of our forefathers, containing all the myths of the Eddas, systematized and interpreted Rasmus Björn Anderson
- Note sur l'invasion des Sarrasins dans le Lyonnais (French) Aimé Vingtrinier
- Of Six Mediæval Women; To Which Is Added A Note on Mediæval Gardens Alice Kemp-Welch
- Olaf the Glorious: A Story of the Viking Age Robert Leighton
- Olavi Maununpoika Pariisissa ja Suomalaisten opinkäynti ulkomailla keski-aialla (Finnish) Yrjö Sakari Yrjö-Koskinen
- Old English Chronicles
- Old English libraries : the making, collection, and use of books during the Middle Ages Ernest Albert Savage
- Old English Physiologus (Old English (ca. 450-1100)) Cynewulf
- Old French Romances, Done into English William Morris
- Old-Time Makers of Medicine James J. Walsh
- Om medeltidens skådespel (Swedish) Gustaf Edvard Ingelius
- One Hundred Merrie And Delightsome Stories
- On the Ruin of Britain Gildas
- Orkneyinga Saga Anonymous
- Otto of the Silver Hand Howard Pyle
- Otto of the Silver Hand Howard Pyle
- Our Catholic Heritage in English Literature of Pre-Conquest Days Emily Henrietta Hickey
- Palæography Bernard Quaritch
- Parish life in mediæval England Francis Aidan Gasquet
- Parish Priests and Their People in the Middle Ages in England Edward Lewes Cutts