| Name | Developer | Publisher | Genre | Operating system | Date released |
| Katawa Shoujo | Four Leaf Studios | Four Leaf Studios | Visual novel, dating sim | Microsoft Windows, Linux, macOS | 24 1 2012 |
| Kenshi | Lo-Fi Games | Lo-Fi Games | Role-playing video game | Microsoft Windows | |
| Kentucky Route Zero | Cardboard Computer | Cardboard Computer | Adventure | Microsoft Windows, Linux, macOS | 07 01 2013 |
| Kerbal Space Program | Squad | Squad | Sandbox | Microsoft Windows, Linux, macOS | 24 6 2011 |
| Kero Blaster | Playism | Daisuke "Pixel" Amaya | Platformer | Microsoft Windows, macOS | 11 5 2014 |
| Killing Floor | Tripwire Interactive | Tripwire Interactive | First-person shooter | Microsoft Windows, Linux, macOS | 14 5 2009 |
| Killing Floor 2 | Tripwire Interactive | Tripwire Interactive | First-person shooter | Microsoft Windows, Linux, macOS | |
| Kingdom: New Lands | Noio | Raw Fury | Strategy, Adventure | Microsoft Windows, Linux, macOS | |
| Kingdom Come: Deliverance | Warhorse Studios | | Action role-playing | Microsoft Windows | 13 02 2018 |
| Kingdom Come: Deliverance II | Warhorse Studios | Deep Silver | Action role-playing | Microsoft Windows | 11 02 2025 |
| Kingdoms of Amalur: Reckoning | 38 Studios, Big Huge Games | 38 Studios, Electronic Arts | Action role-playing, hack and slash | Microsoft Windows | |
| King Arthur: The Role-Playing Wargame | NeocoreGames | Paradox Interactive | Turn-based strategy, real-time tactics | Microsoft Windows | 25 11 2009 |
| King Arthur II: The Role-Playing Wargame | NeocoreGames | Paradox Interactive | Turn-based strategy, real-time tactics | Microsoft Windows | 27 1 2012 |
| Kizuna Encounter: Super Tag Battle "4Way Battle Version" | SNK, Code Mystics | SNK | Fighting, Co-op video game | Microsoft Windows | 11 10 2025 |
| kkrieger | .theprodukkt | .theprodukkt | First-person shooter | Microsoft Windows | 30 4 2004 |
| Knights and Merchants: The Shattered Kingdom | Joymania Entertainment | TopWare Interactive, Interactive Magic | RTS | Microsoft Windows, Linux | 18 09 1998 |