What is a good horror game for someone who has never played one ?

RE7 is a good one

Outlast is very good.

The RE series, Dead Island series and Left for Dead.

Depends what you're looking for in horror games.

I'll always recommend Amnesia: The Dark Descent, it's one of my favourite games from this genre, despite of having nearly 7 years by now.

Allow me to add in the Dead Space games as well.

It depends of your budget and your taste, first or third person? only terror or with enemies to kill? If you like Alien, Alien isolation is a good survival horror.

Soma is another good game, from the creators of amnesia. If you want to enjoy a good story with a touch of horror, this is for you.

I'd have to go with Archi's answer and say Amnesia The Dark Descent.
That game accomplished so much for the horror genre.

Wick
Not to expensive, will scare the living **** out of you.

And Dreadout collection is fairly nice too.

Layers of fear

Resident Evil 0,1,2,3,4,5 (Hidden Chapters DLC), 6 (Leons campaign), 7.
Silent Hill 1,2,3, The Room, Origins, Homecoming, Downpour, Shattered Memories
Dead Space 1, 2 the mobile game (its removed though), the wii game
Outlast + Whistleblower DLC
Obscoure 1,2 (the aftermath on PSP)
Condemned: Criminal Origins
Slenderman games
Untill Dawn
Dead Rising 1 is kinda horrory, it was immersive and kinda scary back at the time
Fear 1,2,3
If you consider yourself being the monster to be scary, The Darkness 2
thats all i can remember

Play alone in the dark, at night with headphones on for the best expierience, it wont be a horror game expierience otherwise.

If you like FPSs, I recommend Clive Barker's Undying

Dying Light, Dead Space, Alien Isolation, Outlast.

Both outlast and the dlc, and Dead space 1 and 2 are really good, you should try them!

Detention

I loved Silence of the Sleep.

Well I think you already got most of the popular answers by now. If you are searching for something slightly different I would like to add these:

• DreadOut
• Corpse Party
• Wait - Extended
• The Last Door Season 1 & 2

The Penumbra trilogy is my favorite horror game. :D Really good game, full with difficult riddles.

dead space, but only the first chapter, better if played on hard difficulty. the second chapter is more like an action/shooter

Resident Evil 1 or 4. More like containing horror elements, but it is closer to action-thriller. Just enough scare factor to ease someone into the setting.

Or just use the shock factor and push them as deep as possible: Amnesia: The Dark Descent or System Shock 1.

Alan wake !! :)

Amnesia: The Dark Descent
Penumbra Collection
SOMA
Outlast (+ Whistleblower DLC)
Alien Isolation
Dead Space
Among the Sleep
The Evil Within