Most Similar Movies to Saw IV (2007)
If you are looking for movies like Saw IV (2007), you might like movies tagged with keyword : serial killer, victim, wife, accomplice, swat officer, fbi agent, gory, suspenseful, brutal, dark, laboratory, crypt, apartment, motel, school, slaughterhouse, torture, morality, investigation, obsession, manhunt, death, pursuit, mystery, revenge, 2000s .
Case 39 (2009), Urban Legends: Final Cut (2000), Sorority Row (2009), Suspiria (2018), The Roommate (2011), Psycho III (1986), Valentine (2001) ... Let's take a look at the following list...

Case 39 (2009)
A social worker fights to save a girl from her abusive parents, only to discover that the situation is more dangerous than she ever expected.
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Urban Legends: Final Cut (2000)
A film school is the center of a fresh spate of killings based on urban legends.
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Sorority Row (2009)
A group of sorority sisters try to cover up the death of their house-sister after a prank gone wrong, only to be stalked by a serial killer.
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Suspiria (2018)
A darkness swirls at the center of a world-renowned dance company, one that will engulf the artistic director, an ambitious young dancer, and a grieving psychotherapist. Some will succumb to the nightmare. Others will finally wake up.
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The Roommate (2011)
When college freshman Sara arrives on campus for the first time, she befriends her roommate, Rebecca, unaware that the girl is becoming dangerously obsessed with her.
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Psycho III (1986)
Norman Bates falls in love with a fallen nun who stays at the Bates Motel alongside a drifter and a curious reporter. Meanwhile, "mother" is still watching.
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Valentine (2001)
Five women are stalked by an unknown assailant while preparing for Valentine's Day.
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Orphan (2009)
A husband and wife who recently lost their baby adopt a 9 year-old girl who is not nearly as innocent as she claims to be.
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What Lies Beneath (2000)
The wife of a university research scientist believes that her lakeside Vermont home is haunted by a ghost - or that she is losing her mind.
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Friday the 13th Part VIII: Jason Takes Manhattan (1989)
A boatful of graduating high school students headed to Manhattan accidentally pull Jason Voorhees along for the ride.
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Friday the 13th: Part 2 (1981)
Mrs. Voorhees is dead, and Camp Crystal Lake is shut down, but a camp next to the infamous place is stalked by an unknown assailant.
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The Town That Dreaded Sundown (2014)
The long gone serial killer seemingly returned again.
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House on Haunted Hill (1999)
An amusement park mogul offers a group of diverse people $1,000,000 to spend the night in a haunted house with a horrifying past.
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Vampire Academy (2014)
Rose Hathaway is a Dhampir, half human-half vampire, a guardian of the Moroi, peaceful, mortal vampires living discreetly within our world. Her calling is to protect the Moroi from bloodthirsty, immortal Vampires, the Strigoi.
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Silent House (2011)
A girl is trapped inside her family's lakeside retreat and becomes unable to contact the outside world as supernatural forces haunt the house with mysterious energy and consequences.
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Fright Night Part 2 (1988)
Charley Brewster and Peter Vincent must face more vampires, out for revenge.
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Dread (2009)
Three college students set out to document what other people dread the most. However, one of the three turns out to secretly be a sadistic psychopath who uses this knowledge to gruesomely torture the subjects.
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Psycho (1998)
A young female embezzler arrives at the Bates Motel, which has terrible secrets of its own.
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