M
- Mac OS
- Mac OS Applications
- Mac OS X Programming
- MacCulloch
- Machinery & Tools for Young Adults
- Macintosh
- Macqueen
- Macroeconomics
- Made in Italy Days - Books
- Mafia & Organised Crime
- Magazines & Printed Matter
- Magdalen Nabb
- Magic
- Magic & Alchemy
- Magic & Fantasy
- Magic & Fantasy Graphic Novels
- Magic for Young Adults
- Magical Realism
- Magical Realist Fiction for Young Adults
- Magician Biographies
- Magicians
- Magnetism & Electromagnetism
- Mains Electrical
- Mairi Hedderwick
- Maison Ikkoku
- Maison Ikkoku Mangas
- Maisy Children's Books
- Make Your Own Easter Treats
- Making Dollhouses
- Making Puppets