Books about hauntings
It isn't always easy to classify a ghost story, especially with someone like David Almond, for instance, who writes on many levels. That's really why I use the word 'hauntings' - in case it is possible to be haunted without a ghost.
If you like a straightforward ghost story, there are plenty of good ones to choose from. Not all ghost stories are scary. If you are a younger reader you might like to meet the Children of Green Knowe. They're really fun. Or if you like tingles up your spine, try something else.