Books about Friendship -- Juvenile fiction (sorted alphabetically)
- Mary Lee the Red Cross Girl Helen Hart
- Mary Louise at Dorfield Emma Speed Sampson
- Master of the Shell Talbot Baines Reed
- Meadow-Brook Girls Under Canvas; Or, Fun and Frolic in the Summer Camp Janet Aldridge
- Meg of Mystery Mountain Grace May North
- Melody : The Story of a Child Laura Elizabeth Howe Richards
- Merriweather Girls in Quest of Treasure Lizette M. Edholm
- Merry Five Penn Shirley
- Messenger No. 48 James Otis
- Mimi at Sheridan School Anne Pence Davis
- Mislaid Uncle Evelyn Raymond
- Miss Ashton's New Pupil: A School Girl's Story Sarah Stuart Robbins
- Missing at Marshlands Cleo F. Garis
- Missing Pocket-Book; Or, Tom Mason's Luck Harry Castlemon
- Miss Mouse and Her Boys Mrs. Molesworth
- Modern Tomboy: A Story for Girls L. T. Meade
- Molly Brown's College Friends Nell Speed
- Mountain-Laurel and Maidenhair Louisa May Alcott
- My Friend Smith: A Story of School and City Life Talbot Baines Reed
- My New Home Mrs. Molesworth
- Mystery of Jockey Hollow Cleo F. Garis
- Mystery of Lost River Canyon Harry Castlemon
- Nan Sherwood at Lakeview Hall; Or, The Mystery of the Haunted Boathouse Annie Roe Carr
- Nan Sherwood at Palm Beach; Or, Strange Adventures Among The Orange Groves Annie Roe Carr
- Nappy has a new friend Inez Hogan