K
- Kaiser Aluminum, Kaiser Motors, Kaiser Permanente, Kaiser Shipyards, Kaiser Steel – Henry J. Kaiser
- Kaiser-Frazer – Henry J. Kaiser and Joseph W. Frazer
- Kärcher – Alfred Kärcher
- Kawasaki Heavy Industries – Kawasaki Shōzō
- Kellogg Company – Will Keith Kellogg
- Kelly Racing – John and Margaret Kelly
- Kevin Harvick Incorporated – Kevin Harvick
- Kimberly-Clark – John A. Kimberly and Charles B. Clark
- King Kullen – Michael J. Cullen, he replaced the "C" with a "K" for marketing purposes.
- Knight Ridder – John S. Knight (Knight Newspapers, Inc.) and Herman Ridder (Ridder Publications, Inc.)
- Koei – Kō Shibusawa and Eiji Fukuzawa (non-existent people)
- Koenigsegg – Christian von Koenigsegg
- Kohl's – Max Kohl
- Kohlberg Kravis Roberts – Jerome Kohlberg, Jr., Henry Kravis, and George R. Roberts
- Kojima Engineering – Matsuhisa Kojima
- Kojima Productions – Hideo Kojima
- Konami – Kagemasa KOuzuki, Yoshinobu NAkama, Tatuso MIyasako (another theory was Hiro Matsuda, and Shokichi Ishihara)
- Konrad Motorsport – Franz Konrad
- Kraft Foods – James L. Kraft
- Kremer Racing – Erwin and Manfred Kremer
- Kroger – Bernard Kroger
- Kruse International – Russell W. Kruse
- Kwanon – Kannon (Japanese for the Buddhist bodhisattva Guan Yin)
- Kurtis Kraft – Frank Kurtis
- Kuzma – Eddie Kuzma
Read more about this topic: List Of Companies Named After People