| Kimera Evo 2021-current | coupes, custom-builds, Kimera, Lancia |
| Kimera K39 2024+ | hillclimb-racing, Kimera, racing-vehicles |
| Kioti K9 | |
| Kioti Mechron | |
| Kleinschnittger F-125 / F-250 1950-1957 | microcars |
| KMR Oura | |
| Kodiak F1 | |
| Koenig Competition 1987-1992 | coupes, custom-builds, Ferrari, Koenig, supercars |
| Koenig Ferrari 512TR 1985-1987 | coupes, custom-builds, Ferrari, Koenig, supercars |
| Koenig Specials C62 1990-1991 | coupes, custom-builds, Koenig, Porsche, supercars |
| Koenigsegg Agera variants 2010-2018 | fh5-roster, hypercars, Koenigsegg, open-top-cars |
| Koenigsegg CC Prototype 1994-2000 | concepts-prototypes, coupes, Koenigsegg, supercars |
| Koenigsegg CC850 2024 | hypercars, Koenigsegg, open-top-cars |
| Koenigsegg CCR 2004-2006 | hypercars, Koenigsegg, open-top-cars |
| Koenigsegg CCXR 2008-2010 | fh1-roster, hypercars, Koenigsegg, open-top-cars |
| Koenigsegg Chimera 2024 | coupes, custom-builds, hypercars, Koenigsegg |
| Koenigsegg Gemera 2024-current | coupes, hybrid-vehicles, hypercars, Koenigsegg |
| Koenigsegg Jesko / Sadair’s Spear variants 2021-current | coupes, fh5-roster, hypercars, Koenigsegg |
| Koenigsegg Quant concept 2009-2009 | concepts-prototypes, Koenigsegg |
| Korres P4 2014 | Korres, Offroad, supercars |
| Krugger FD 2020 | Krugger |
| KTM AX 2008 | buggies-atvs, concepts-prototypes, hybrid-vehicles, KTM, Offroad |
| KTM X-Bow GT4 Evo (GT racing) 2019-current | fh5-roster, GT-racing, KTM, racing-vehicles |
| KTM X-Bow JP Performance Momentum 2019 | custom-builds, KTM, open-top-cars, sports-cars |
| KTM X-Bow variants 2008-current | coupes, fh5-roster, KTM, open-top-cars, sports-cars |
| Kubota RTV 1100 | |
| Kubota RTV-X | |
| KVAB Tjorven 1969-1972 | |
| Kwadi CR III |