Books about Youth -- Conduct of life -- Juvenile fiction (sorted alphabetically)
- Making the Nine Albertus T. Dudley
- Marie Laura Elizabeth Howe Richards
- Marigold's decision Agnes Giberne
- Mark Manning's Mission: The Story of a Shoe Factory Boy Jr. Horatio Alger
- Mark Mason's Victory Jr. Horatio Alger
- Mark the Match Boy; or, Richard Hunter's Ward Jr. Horatio Alger
- Marvelous Land of Oz L. Frank Baum
- Marvelous Land of Oz L. Frank Baum
- Marvelous Land Of Oz L. Frank Baum
- Master Key L. Frank Baum
- Master Key L. Frank Baum
- Master Key L. Frank Baum
- Master Rockafellar's Voyage William Clark Russell
- Merry Five Penn Shirley
- Mildred's Inheritance; Just Her Way; Ann's Own Way Annie F. Johnston
- Miles Lawson : or, the Yews Mrs. W. Reynolds Lloyd
- Missing Pocket-Book; Or, Tom Mason's Luck Harry Castlemon
- naval cadet: A story of adventures on land and sea Gordon Stables
- Ned in the Block-House: A Tale of Early Days in the West Edward Sylvester Ellis
- Not Quite Eighteen Susan Coolidge
- On Guard: Mark Mallory's Celebration Upton Sinclair
- Oscar in Africa Harry Castlemon
- Our Fellows; Or, Skirmishes with the Swamp Dragoons Harry Castlemon
- Out with Garibaldi: A story of the liberation of Italy G. A. Henty
- Philippa Mrs. Molesworth