Series starting with M
- Morgan and Class 3
- Morgan Brothers
- Morgan-Challenger
- Morgan Kaufmann Series in Representation and Reasoning
- Morgan Kingsley
- Morgan Ranch
- Morgans of Nashville
- Morgue Mama Mysteries
- Morisaki Bookshop
- Morlac
- Morning Star
- Moroni Traveler
- Mortal Coils
- Mortal Engines
- Mortal Engines Quartet
- Mortelle Adèle
- Mort the Meek
- Mosby's Textbook for Medication Assistants
- Mosquito
- Moss
- Mossad
- Most of All You
- Most Wanted
- Mother Goose
- Motherless Children
- Motherless Children Trilogy
- Motherlove Stories by Women about Motherhood
- Moties
- Motley and Fuzzball
- Motocourse
- Mots en images
- Mount
- Mountain Lodge Mystery
- Mount Trilogy
- Mouse and Mole
- Mouse Books
- Mouseford Academy
- Mouse Guard
- Mouse House
- Mouthmark
- Move Up
- Mozart
- MPD Psycho
- Mr. and Mrs. Haddock
- Mr. Boyd
- Mr. Chickee
- Mr. Dooley
- Mr. Gryce
- Mr. Hopper's Class
- Mr. Horse
- Mr. Lemoncello's Library
- Mr. Merlin
- Mr. Monk
- Mr. & Mrs. Haddock
- Mr. & Mrs. North
- Mr. Natural
- Mroczny Zakątek
- Mr. Penumbra's 24-Hour Bookstore
- Mr. Popper's Penguins
- Mrs. 'Arris
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