Sure there are. The Old Testament relates that Samuel's ghost appeared to King Saul. Jesus and the first disciples spoke about ghosts matter-of-factly and never denied there were such things.
Even, so demons also can appear as ghosts to trick people. Ghosts are not evil, but demons are. A Christian needs to be able to discern the difference.
21 posted on 04/21/2016 8:18:51 PM PDT by fidelis
(Zonie and USAF Cold Warrior)