| Maison, Jessica | Mary Shelley's School for Monsters: The Killing Stone | Graphic Novel | Horror, Paranormal |
| Mangan, Amelia | “Death Valley ’71” by Mangan, Amelia | Short Story (up to 7,500 words) | Horror, Speculative, Weird |
| Manners, Arthur | Woodsong | Flash (up to 1,500 words) | Horror |
| McCarthy, J. A. W. | “Severed Blessings” by McCarthy, J. A. W. | Short Story (up to 7,500 words) | Fantasy, Horror, Speculative |
| McCarthy, J. A. W. | “The Body is a Cage Opened Only by Fire” by McCarthy, J. A. W. | Short Story (up to 7,500 words) | Fantasy, Horror, Speculative |
| McDermott, Will | “Caretakers” by McDermott, Will | Short Story (up to 7,500 words) | Horror, Weird |
| Mehrotra, Rati | “Men With Tails” by Mehrotra, Rati | Short Story (up to 7,500 words) | Horror, Paranormal |
| Miller, Devin | "the trick of the necromancer's womb" | Poetry | Horror, Speculative |
| Mitchell, G. M. | “A Rare and Exceptional Delicacy” by Mitchell, G. M. | Short Story (up to 7,500 words) | Horror |
| Mohamed, Premee | "Hunted to Extinction" | Novelette (between 7,500 and 17,500 words) | Horror |
| Mohamed, Premee | "Replacement Wanted" | Short Story (up to 7,500 words) | Horror |
| Mohamed, Premee | "One of Those Girls" | Short Story (up to 7,500 words) | Horror |
| Mohamed, Premee | "Songs Never Sung" | Flash (up to 1,500 words), Short Story (up to 7,500 words) | Horror |
| Moon, Richard H. | To Conquer Death by Moon, Richard H. | Novel (40,000 words and up) | Fantasy, Horror |
| Morrissey, Ted | “The Unbearable Sweetness” by Morrissey, Ted | Short Story (up to 7,500 words) | Cyberpunk, Horror, Science Fiction |
| Multiple Authors | Castle of Horror Anthology Volume 12 by Multiple Authors | Anthology | Horror |
| Multiple Authors | Cats of Ulthar: A Tale Reimagined by Multiple Authors | Graphic Novel, Indie | Fantasy, Horror |
| Multiple Authors | Combat Monsters: Untold Tales of World War II by Multiple Authors | Anthology | Alt History, Fantasy, Horror, Military SFF, Science Fiction, Speculative, Weird |
| Multiple Authors | Storyteller: A Tanith Lee Tribute Anthology by Multiple Authors | Anthology | Environmental / Cli-Fi, Fantasy, Horror, Humorous, Near Future, Romantasy, Science Fiction, Second-world Fantasy, Speculative, Weird |
| Multiple Authors | Storyteller: A Tanith Lee Tribute Anthology | Anthology | Environmental / Cli-Fi, Fantasy, Horror, Humorous, Near Future, Romantasy, Science Fiction, Second-world Fantasy, Space Opera, Speculative, Weird |
