Books

Novels

Stephen King is very hit and miss but I loved Salem's Lot.

Kim Newman's Anno Dracula series is kind of alternative universe history themed where the premise is that the events of Bram Stokers Dracula actually happened but the main characters failed to kill Dracula so he takes over Victorian Britain. Popcorn stuff but fun if you like hypotheticals like "what if Oscar Wilde was a vampire?"

Short stories

Classics like Borges and Poe have a few existential horror stories like The Aleph by Borges. Borges is more consistent than Poe. Lovecraft is similar to Poe but not quite as good for me.

More modern short stories I'd definitely recommend some Ted Chiang for sci-fi horror (some lean more towards pure sci-fi but many are horror). It's a shame Neil Gaiman is allegedly such a monster because he had some good horror short story collections.

Manga

Junji Ito manga are well worth reading. Often you can find scanlations of the best stories through web searching but the books are also cheap on kindle; and look good with e-ink since it's all black and white.

Let's go play at the Adams' - I read it a year or so ago, still think about it on the regular.

Camp Damascus by Chuck Tingle is a fav of mine.

The Keep by F Paul Wilson.

I like Stephen Graham Jones. "The Only Good Indians" had parts that I thought were disturbing.

I've been reading T. Kingfisher lately and in absolutely in love. I picked up The Hollow Places thinking it would probably be a waste but it's become my favorite book. I've just started What Moves the Dead, and in already hooked, her descriptive ability is immaculate.

I would also recommend The Luminous Dead by Caitlin Sterling, Hide by Kiersten White, and Bunny by Mona Awad.

One of my favourite horror novels of the last decade is John Langan’s The Fisherman. He’s an absolutely fantastic writer.

• Walking to Aldebaran by Adrian Tchaikovsky is a real gem (a short story)
• Dead Silence by S.A. Barnes
• Southern Reach series by Jeff VanderMeer is excellent
• The Talents Trilogy by J.M. Miro is pretty good horror in Victorian setting
• currently reading Shroud by Adrian Tchaikovsky, it's a decent sci fi horror

“Night Shift,” “Skeleton Crew,” “The Dunwich Horror.”

Maybe these are obvious answers, IDK what level of mainstreamness you want. But they are excellent if by some chance you haven’t read them.