- Keith Laumer Super Pack
- Keith Laumer's Retief
- Keith Roberts SF Gateway Omnibus
- Kepler's Cowboys
- Ketama
- Kevin and the Multicolored Infinity Car of Light
- KeyForge: Tales From the Crucible
- Keystone Chronicles
- Kiki 'sTale
- Kilgore's Five Stories #12: July 2021
- Kill the Past, Destroy the World
- Killing London
- Killing Time
- Killing Violets
- King of Peace and Glory
- King of the World
- Kingdom Bundle: Levels 1-4 LitRPG Epic Fantasy
- Kingston's Legacy & Nothing but the Stars
- Kingdom Bundle: Levels 1-4 LitRPG Epic Fantasy
- Kingston's Legacy & Nothing but the Stars
- Kira
- Kirinyaga
- Kitchen Sink
- Kittens In The Emu Field
- Knaves Over Queens
- Knights of the Lion: a Call to Arms
- Konan Destylator
- Konačni Izveštaj
- Konstantin: A Short Story
- Konundrum
- KOROLEVA
- Kosmische Wanderer: Science Fiction Fantasy Großband 11/2020
- Krakentang
- Krisenfall Methanwelt: Science Fiction Fantasy Großband 9/2020
- Kristal Helder