According to the UK newspaper The Guardian, here is a list of the Top 50 book to film adaptations of all time (a list, oddly enough, containing 51 items). Note which ones you’ve seen the movie of and/or read the book for. For films with multiple adaptations, any film adaptation counts.
[MB] 1984 [MB] Alice in Wonderland American Psycho [M] Breakfast at Tiffany’s Brighton Rock [B] Catch 22 [MB] Charlie & the Chocolate Factory [M] A Clockwork Orange Close Range (inc Brokeback Mountain) [M] The Day of the Triffids Devil in a Blue Dress [M] Different Seasons (inc The Shawshank Redemption) [MB] Do Androids Dream of Electric Sheep? (aka Bladerunner) [M] Doctor Zhivago Empire of the Sun The English Patient Fight Club The French Lieutenant’s Woman Get Shorty [M] The Godfather [MB] Goldfinger [M] Goodfellas [MB] Heart of Darkness (aka Apocalypse Now) [MB] The Hound of the Baskervilles Jaws [MB] The Jungle Book A Kestrel for a Knave (aka Kes) LA Confidential [MB] Les Liaisons Dangereuses [MB] Lolita Lord of the Flies [MB] The Maltese Falcon [MB] Oliver Twist [M] One Flew Over the Cuckoo’s Nest Orlando The Outsiders [MB] Pride and Prejudice The Prime of Miss Jean Brodie The Railway Children Rebecca [M] The Remains of the Day [M] Schindler’s Ark (aka Schindler’s List) [B] Sin City [M] The Spy Who Came in From the Cold The Talented Mr Ripley [MB] Tess of the D’Urbervilles [MB] To Kill a Mockingbird Trainspotting The Vanishing [MB] Watership Down