I'll avoid some of the great suggestions already made (The Witch and Neon Demon for example).
White Ribbon (2009) I want to say something just very quickly about this movie. It's mostly unlike anything in the modern era, in my opinion a masterpiece. Not brutality horror or anything like that, I think everyone simply desrves one day to watch this if they're past their teenage years.
Funny Games (2007) Same director, more grounded as we understand the genre of Horror
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The rest of these you can simply pick out at random, in no particular order some of my favorites.
VHS (2012)
Sinister (2012)
The Conspiracy (2012)
Starry Eyes (2014)
Wolf Creek (2005)
Bone Tomahawk (2015)
A Dark Song (2016)
The Conjuring (2013)
Let the Right One In (2008)
The House of the Devil (2009)
The Mist (2007)
☆ It Follows (2015)
The Descent (2005)
☆ Get Out (2017)
Hereditary (2018)
The Skin I Live In (2011)
Shutter Island (2010)
Event Horizon (1997)
Hounds of Love (2016)
Honeymoon (2014)
Kill List (2011)
The Crazies (2010)
The Woman (2011)
The Invitation (2015)
Creepy (2016)
The Wailing (2016)
☆ Under the Skin (2013)
Annihilation (2018)
I visited the thread and the few titles I picked @ random before visiting were already mentioned ... in the first post " A Quiet Place", just above ... "Get Out", "It Follows", "Under The Skin". Someone else mentioned ... "The Others". Another one already mentioned ... "The Cabin in the Woods" which is a comedy/horror...and in some ways "Get Out" too.
I recently revisited this one by accident ...
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