Harry Potter series
Lightning Thief by Rick Riordan
Avengers graphic novels by Marvel
The Martian by Andy Weir (science fiction)
Paper Towns or Fault in Our Stars by John Green
Hunger Games series by Suzanne Collins
Great Gatsby by F. Scott Fitzgerald (historical fiction)
Book Thief by Marcus Zusak (historical fiction)
Da Vinci Code by Dan Brown (mystery)
One for the Money by Stephanie Plum (comedy/mystery)
Gone Girl by Vince Flynn (mystery)
Water for Elephants by Sara Gruen (other fiction)
Time Traveler's Wife by Audrey Nifenegger (sci fi/romance)
The list is pretty endless and browsing for a title might not be as easy on the forums (these are just off the top of my head, but I honestly could keep going for quite a while

As you're reading, ask yourself (in addition to the usual questions), what elements made this book good to make into a movie?