For pirate fiction novels, you can't go wrong with 'The Corsair' by Byron. It gives an interesting look into the life of a pirate. There are also some newer entries like 'The Bloody Jack' series by L.A. Meyer. These books follow the adventures of a girl who disguises herself as a boy and becomes a pirate. They are full of action, adventure, and the unique culture of the pirate world. Plus, they are really engaging reads for those interested in pirate fiction.
Well, 'On Stranger Tides' by Tim Powers is a really cool pirate fiction novel. It has a lot of elements like voodoo and ancient secrets combined with pirate life. Then there's 'Captains Courageous' by Rudyard Kipling which, while not strictly only about pirates, has a great deal of nautical and adventure themes that pirates are often associated with. Also, 'The Sea Hawk' by Rafael Sabatini is a wonderful choice, full of swashbuckling pirate action.