I recently reviewed two books with a middle school boy audience. The resulting “Fictional Character” article enticed my older daughter to offer suggestions for middle school readers.
I like adventure and fantasy books with journeys.
-the college student

Books for reluctant middle school readers
Kingdom Keepers by Ridley Pearson
Ivy and Bean by Annie Barrows
Magic Treehouse by Mary Pope Osborne
Harry Potter by J.K. Rowling
Robinson Crusoe by Daniel Defoe
Ella Enchanted and Fairest by Gail Carson Levine
The Case of the Missing Marquess (Enola Holmes series) by Nancy Springer
Peter Pan by J.M. Barrie
The Tale of Despereaux by Kate DiCamillo
The Velveteen Rabbit by Margery Williams Bianco
Holes by Louis Sachar
Encyclopedia Brown series by Donald J. Sobol
Boy Proof and The Queen of Cool by Cecil Castellucci
The Bad Beginning by Lemony Snicket
Freak the Mighty by Rodman Philbrick (okay, this is my suggestion)

Books for advanced middle school readers
Peter and the Starcatchers by Dave Barry and Ridley Pearson
Artemis Fowl by Eoin Colfer
Skulduggery Pleasant by Derek Landy
The Swiss Family Robinson by Johann David Wyss
Princess Academy by Shannon Hale
The Name of This Book is Secret by Pseudonymous Bosch
Featured image by Muhammad Rehan on Flickr. Other images provided by Internet Archive Book Images on Flickr and by ReusableArt.com (Pegasus by Walter Crane from A Wonder Book for Girls & Boys by Nathaniel HawthorneImages).