Idea from Zā. Films where I've also read the book they were based on. Multiple adaptations are included. I've probably forgotten lots of children's books and am sure I've seen more than two versions of Jane Eyre but can't remember which.
Haven't included plays e.g. Shakespeare, Tennessee Williams.
Hangover Square doesn't count as the film is radically different. Same with Clueless and Bride and Prejudice which are clearly inspired by novels but not strict adaptations.
Poirot, and Sherlock Holmes are incomplete but I've read all of them so if I come across any more adaptations I've seen I'll add them as and when. I can't remember the names of all the Marple I've read so have left lots off to be on the safe side.