I've compiled a list of movies that are currently in theatres that are based on books (I know some of them are old, but I went by moviefone.com's "now in theaters list"). I've spent a few hours researching each movie to make sure it is in fact based on a book. If I've gotten anything wrong, or if I've missed any, please let me know in a comment, and I'll update the list.
Please note, I intend to add descriptions of each movie as soon as I get a chance.
The Sorcerer's Apprentice
Based on the poem by German writer Johann Wolfgang von Goethe
(I know this isn't technically a book, but I've added it anyway)
Based on the book: Eclipse by Stephenie Meyer
From the Twilight series
The Girl Who Played With Fire
Based on the book The Girl Who Played With Fire: by Stieg Larsson
The second novel in the Millennium Trilogy
The Killer Inside Me
Based on the book: The Killer Inside Me by Jim Thompson
A 1952 novel
Coco Chanel & Igor Stravinsky
Based on the book: Coco & Igor by Chris Greenhalgh
A 2002 fictional novel
Based on the book: Shutter Island by Dennis Lehane
Sex and the City
Based on the book: Sex and the City by Candace Bushnell
The movie was actually based on the television series, but the tv series is based on the book.
Based on the book: Shrek! by William Steig
The first Shrek was the one based on this book which was an illustrated fairy tale.
Alice in Wonderland
Based on the book: Alice in Wonderland by Lewis Caroll
Lewis Caroll's read name was Charles Lutwidge Dodgson
Based on the book: The Cure by Geeta Anand
How to Train Your Dragon
Based on the book: How to Train Your Dragon by Cressida Cowell
Loosely based on the book.
Based on the book: Neon Angel: A Memoir of a Runaway by Cherie Currie
Cherie Currie is the band in the movie's original lead
The Secret in Their Eyes
Based on the book: La pregunta de sus ojos by Eduardo Sacheri
The English name of the book is The Question in Their Eyes.
The Last Song
Based on the book: The Last Song by Nicolas Sparks
The Girl With The Dragon Tattoo
Based on the book: The Girl With The Dragon Tattoo by Stieg Larsson
This is the first book in the Millennium Trilogy
Diary of a Wimpy Kid
Based on the series: Diary of a Wimpy Kid by Jeff Kinney
The Ghost Writer
Based on the book: The Ghost by Robert Harris
Based on the book: De helaasheid der dingen by Dimitri Verhulst
This book is by a Flemish author
The Perfect Game
Based on the book: The Perfect Game by W. William Winokur
Based on the book: Winter's Bone by Daniel Woodrell
Anton Chekhov's The Duel
Based on the book: The Duel by Anton Checkhov
The Duel is a novella written in 1891
Based on the book: Mercy by David L. Lindsey
Based on the diaries of: John Rabe
Which ones have you read or seen?