Besides my favorite authors of all time, most of which I discovered as a middle-grade reader and teenager, I have random, more recent loves:

I Capture the Castle, by Dodie Smith
Jellicoe Road, by Melina Marchetta
The Year of Secret Assignments, by Jaclyn Moriarty
The Penderwicks on Gardam Street, by Jeanne Birdsall
Cosmic, by Frank Cottrell Boyce
Framed, by Frank Cottrell Boyce
Masterpiece, by Elise Broach
Trouble, by Gary Schmidt
We Have Always Lived in the Castle, by Shirley Jackson
Leepike Ridge, by N.D. Wilson
Roller Skates, by Ruth Sawyer
The Boneshaker, by Kate Milford
Fly by Night, by Frances Hardinge
Saving Francesca, by Melina Marchetta
Any Which Wall, by Laurel Snyder
The Mostly True Adventures of Homer P. Figg, by Rodman Philbrick
When You Reach Me, by Rebecca Stead
The Evolution of Calpurnia Tate, Jacqueline Kelly