- Sinkhole: A Novella of Terror
- Sinking Stones in the Sky
- Sinner Collection: The Deathbringer
- Sinners Beware
- SINS IN HELL
- Sins Of Eight
- Sins of Mars
- Sins of Retribution
- Sins of the Father
- Sins of the Fetus Man
- Sins of the Flesh
- Sins of the Sirens
- Sins of the Son: A Tale of Bluebeard
- Sins of The Sparrow
- Sips of Blood
- Sir Charles Stands Down
- Sir Dominick's Bargain
- Sir Edmund Orme
- Sir Edmund Orme (1891)
- Siren Promised
- Siren Song
- Sirens
- Sirviente de la Pluma Roja
- Siskele
- Sissy the Vampire Hummingbird Slayer
- Sister Moon
- Sister of the Walking Dead (My Little Brother is a Zombie, Book 2)
- Sister's Revenge
- Sisterhood of the Serpent
- Sisters
- Sisters Of Salt And Iron
- Sisters of the Wild Sage: A Weird Western Collection
- Sitting On The Corner
- Siunattu sukuveri
- Six
- Six After Midnight
- Six and Seven
- Six Dead Spots
- Six Dead Spots
- Six Faces
- Six Flashes of Parchment
- Six Fright-Mares
- Six in the Underworld
- Six Little Tales of Dread
- Six Miles Of Darkness
- Six Plus One
- Six Short Stories
- Six Sixteen
- Six-Pack of Blood
- Six-Pack of Fear
- Sixteen Small Deaths: A Collection of Stories
- Size Zero
- Sjambak
- SKA: Serial Killers Anonymous
- Skadegamutc
- Skadustemme
- Skallarna
- Skargat 2
- Skarna e altre storie
- Skeleton Cowboys
- Skeleton Key
- Skeleton of the Onondaga
- Skeletons
- Skeletons in the Closet & Other Creepy Stories
- Sketches of the Wigwam
- Skies of Grey Part One: The Place in the Mist
- Skin & Bones
- Skin Crawl: Darkly Erotic Horror Stories
- Skin Deep
- Skin Deep: A Horror Story
- Skin Folk
- Skin Food
- SKIN MEDICINE - Die letzte Grenze
- Skin of the Wolf
- Skin Shifters
- Skin Trade
- Skinner Box
- Skinners Book 7 Forged From Ash
- Skinny
- Skinshift
- Skinwalker! Cradle of the Water Babies
- Skinwalker! Summer of Stolen Souls
- Skinwalking
- Skinware
- Skitzo
- Skook
- Skräcknoveller
- Skuggan över Providence
- Skulduggery Pleasant (Band 11) - Mitternacht
- Skulduggery Pleasant (Band 7) - Duell der Dimensionen
- Skulduggery Pleasant (Band 7-9) inklusive eShort
- Skulduggery Pleasant (Band 9) - Das Sterben des Lichts
- Skulduggery Pleasant - Apokalypse, Wow!
- Skull Face
- Skull Feeder
- SKULL MOON
- Skull Throne
- Skull-Face
- Skullface
- O Skullman 2017
- Skullworm
- Skylight Dying
- Skyquake
- Skyships Over Innsmouth
- Slade House
- Slain in the Spirit
- Slash Forward
- Slash Right
- Slashed
- Slasher
- Slashertorte: An Anthology of Cake Horror
- Slaughter Daughter