My top favorites:
The Haunting
The Changeling This George C. Scott movie is probably the one that got me going as a ghost hunter. It was a combination of the active haunted house (I grew up in one) and the EVP session on tape that made me wonder-what are they trying to tell us that we're not hearing???
The Amityville Horror
Poltergeist
The Legend of Hell House
Insidious
The Fog
Secondary favs:
The Uninvited
13 Ghosts
Grave Secrets: The Legacy of Hilltop Drive
The Evil Classic 1978 movie is about a group of people trapped inside a crazy haunted house. This movie was missed by a lot of folks and is worth the search. Stars Richard Crenna.
Stir of Echoes
Burnt Offerings
Honorable mentions:
The Grudge
The Others
Paranormal Activity
The Innocents
Beetlejuice
Something Evil A made-for-tv style Steven Spielberg haunted house movie--great on groovy 70s vibes and city folks move to country theme. Not super on scares, but unsettling.
Rose Red
Ghostbusters
The Ghost and Mr. Chicken
A Haunting in Connecticut
The Sentinel
The Watcher in the Woods
Death of a Ghost Hunter
Knocking on Death's Door
Ghost in the Machine