The Horror! The Horror!

I got my own definition of the horror genre, meaning you will find some movies in this list which are not tagged 'horror' but they in fact ARE terrifying.
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1.
The Evil Dead (1981)
    1 2 3 4 5 6 7 8 9 10 7.5/10 X  
Five friends travel to a cabin in the woods, where they unknowingly release flesh-possessing demons. (85 mins.)
Director: Sam Raimi
 
2.
The Exorcist (1973)
    1 2 3 4 5 6 7 8 9 10 8.0/10 X  
When a teenage girl is possessed by a mysterious entity, her mother seeks the help of two priests to save her daughter. (122 mins.)
 
3.
Sleepy Hollow (1999)
    1 2 3 4 5 6 7 8 9 10 7.4/10 X  
Ichabod Crane is sent to Sleepy Hollow to investigate the decapitations of 3 people with the culprit being the legendary apparition, the Headless Horseman. (105 mins.)
Director: Tim Burton
 
4.
A Tale of Two Sisters (2003)
    1 2 3 4 5 6 7 8 9 10 7.3/10 X  
A family is haunted by the tragedies of deaths within the family. (115 mins.)
Director: Kim Jee-woon
 
5.
Audition (1999)
    1 2 3 4 5 6 7 8 9 10 7.2/10 X  
A widower takes an offer to screen girls at a special audition, arranged for him by a friend to find him a new wife. The one he fancies is not who she appears to be after all. (115 mins.)
Director: Takashi Miike
 
6.
Twin Peaks: Fire Walk with Me (1992)
    1 2 3 4 5 6 7 8 9 10 7.2/10 X  
A young FBI agent disappears while investigating a murder miles from Twin Peaks that may be related to the future murder of Laura Palmer; the last week of the life of Laura Palmer is chronicled. (135 mins.)
Director: David Lynch
 
7.
Mulholland Dr. (2001)
    1 2 3 4 5 6 7 8 9 10 8.0/10 X  
After a car wreck on the winding Mulholland Drive renders a woman amnesiac, she and a perky Hollywood-hopeful search for clues and answers across Los Angeles in a twisting venture beyond dreams and reality. (147 mins.)
Director: David Lynch
 
8.
388 Arletta Avenue (2011)
    1 2 3 4 5 6 7 8 9 10 4.9/10 X  
A young couple find themselves in an unnerving situation with a mysterious stalker. (87 mins.)
Director: Randall Cole
 
9.
American Psycho (2000)
    1 2 3 4 5 6 7 8 9 10 7.6/10 X  
A wealthy New York investment banking executive hides his alternate psychopathic ego from his co-workers and friends as he delves deeper into his violent, hedonistic fantasies. (102 mins.)
Director: Mary Harron
 
10.
Antichrist (2009)
    1 2 3 4 5 6 7 8 9 10 6.6/10 X  
A grieving couple retreat to their cabin in the woods, hoping to repair their broken hearts and troubled marriage. But nature takes its course and things go from bad to worse. (108 mins.)
Director: Lars von Trier
 
11.
Carrie (1976)
    1 2 3 4 5 6 7 8 9 10 7.4/10 X  
Carrie White, a shy, friendless teenage girl who is sheltered by her domineering, religious mother, unleashes her telekinetic powers after being humiliated by her classmates at her senior prom. (98 mins.)
Director: Brian De Palma
 
12.
Dagon (2001)
    1 2 3 4 5 6 7 8 9 10 6.3/10 X  
A boating accident runs a young man and woman ashore in a decrepit Spanish fishing town which they discover is in the grips of an ancient sea god and its monstrous half human offspring. (95 mins.)
Director: Stuart Gordon
 
13.
Dead Ringers (1988)
    1 2 3 4 5 6 7 8 9 10 7.3/10 X  
Twin gynecologists take full advantage of the fact that nobody can tell them apart, until their relationship begins to deteriorate over a woman. (116 mins.)
 
14.
Don't Look Now (1973)
    1 2 3 4 5 6 7 8 9 10 7.3/10 X  
A married couple grieving the recent death of their young daughter are in Venice when they encounter two elderly sisters, one of whom is psychic and brings a warning from beyond. (110 mins.)
Director: Nicolas Roeg
 
15.
Donnie Darko (2001)
    1 2 3 4 5 6 7 8 9 10 8.1/10 X  
A troubled teenager is plagued by visions of a man in a large rabbit suit who manipulates him to commit a series of crimes, after he narrowly escapes a bizarre accident. (113 mins.)
Director: Richard Kelly
 
16.
Event Horizon (1997)
    1 2 3 4 5 6 7 8 9 10 6.7/10 X  
A rescue crew investigates a spaceship that disappeared into a black hole and has now returned...with someone or something new on-board. (96 mins.)
Director: Paul Anderson
 
17.
Funny Games (1997)
    1 2 3 4 5 6 7 8 9 10 7.6/10 X  
Two violent young men take a mother, father, and son hostage in their vacation cabin and force them to play sadistic "games" with one another for their own amusement. (108 mins.)
Director: Michael Haneke
 
18.
Hannibal (2001)
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
Living in exile, Hannibal Lecter tries to reconnect with now disgraced FBI agent Clarice Starling and finds himself a target for revenge from a powerful victim. (131 mins.)
Director: Ridley Scott
 
19.
Hour of the Wolf (1968)
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
While vacationing on a remote Scandanavian island with his younger pregnant wife, an artist has an emotional breakdown while confronting his repressed desires. (90 mins.)
Director: Ingmar Bergman
 
20.
Insidious (2010)
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
A family looks to prevent evil spirits from trapping their comatose child in a realm called The Further. (103 mins.)
Director: James Wan
 
21.
Jaws (1975)
    1 2 3 4 5 6 7 8 9 10 8.0/10 X  
A giant great white shark arrives on the shores of a New England beach resort and wreaks havoc with bloody attacks on swimmers, until a local sheriff teams up with a marine biologist and an old seafarer to hunt the monster down. (124 mins.)
 
22.
Lost Highway (1997)
    1 2 3 4 5 6 7 8 9 10 7.6/10 X  
After a bizarre encounter at a party, a jazz saxophonist is framed for the murder of his wife and sent to prison, where he inexplicably morphs into a young mechanic and begins leading a new life. (134 mins.)
Director: David Lynch
 
23.
Night of the Living Dead (1968)
    1 2 3 4 5 6 7 8 9 10 7.9/10 X  
There is panic throughout the nation as the dead suddenly come back to life. The film follows a group of characters who barricade themselves in an old farmhouse in an attempt to remain safe from these flesh eating monsters. (96 mins.)
 
24.
Pandorum (2009)
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
A pair of crew members aboard a spaceship wake up with no knowledge of their mission or their identities. (108 mins.)
 
25.
Phenomena (1985)
    1 2 3 4 5 6 7 8 9 10 6.9/10 X  
A young girl, with an amazing ability to communicate with insects, is transferred to an exclusive Swiss boarding school, where her unusual capability might help solve a string of murders. (116 mins.)
Director: Dario Argento
 
26.
Pontypool (2008)
    1 2 3 4 5 6 7 8 9 10 6.7/10 X  
A psychological thriller in which a deadly virus infects a small Ontario town. (93 mins.)
Director: Bruce McDonald
 
27.
Rosemary's Baby (1968)
    1 2 3 4 5 6 7 8 9 10 8.0/10 X  
A young couple move into an apartment, only to be surrounded by peculiar neighbors and occurrences. When the wife becomes mysteriously pregnant, paranoia over the safety of her unborn child begins to control her life. (137 mins.)
Director: Roman Polanski
 
28.
Scanners (1981)
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
A scientist sends a man with extraordinary psychic powers to hunt others like him. (103 mins.)
 
29.
Suspiria (1977)
    1 2 3 4 5 6 7 8 9 10 7.5/10 X  
A newcomer to a fancy ballet academy gradually comes to realize that the school is a front for something far more sinister and supernatural amidst a series of grisly murders. (98 mins.)
Director: Dario Argento
 
30.
The Cell (2000)
    1 2 3 4 5 6 7 8 9 10 6.3/10 X  
An FBI agent persuades a social worker, who is adept with a new experimental technology, to enter the mind of a comatose serial killer in order to learn where he has hidden his latest kidnap victim. (107 mins.)
Director: Tarsem
 
31.
The Fourth Kind (2009)
    1 2 3 4 5 6 7 8 9 10 5.9/10 X  
A thriller involving an ongoing unsolved mystery in Alaska, where one town has seen an extraordinary number of unexplained disappearances during the past 40 years and there are accusations of a federal cover up. (98 mins.)
 
32.
The Shining (1980)
    1 2 3 4 5 6 7 8 9 10 8.4/10 X  
A family heads to an isolated hotel for the winter where an evil and spiritual presence influences the father into violence, while his psychic son sees horrific forebodings from the past and of the future. (146 mins.)
Director: Stanley Kubrick
 
33.
The Thing (1982)
    1 2 3 4 5 6 7 8 9 10 8.2/10 X  
A research facility in Antarctica comes across an alien force that can become anything it touches with 100% accuracy. The members must now find out who's human and who's not before it's too late. (109 mins.)
Director: John Carpenter
 
34.
The Thing (2011)
    1 2 3 4 5 6 7 8 9 10 6.2/10 X  
At an Antarctica research site, the discovery of an alien craft leads to a confrontation between graduate student Kate Lloyd and scientist Dr. Sander Halvorson. (103 mins.)
 
35.
[Rec] (2007)
    1 2 3 4 5 6 7 8 9 10 7.5/10 X  
A television reporter and cameraman follow emergency workers into a dark apartment building and are quickly locked inside with something terrifying. (78 mins.)