Katalog firm
- John Katja LKJ
- John Kelly
- John Kent Solicitors
- John King Chains
- John King Polska S.A.
- John Kingston Estate Agents
- John Kirk Hifi
- John Knibbs International Ltd
- John Kubiniec JOHN KUBINIEC KONSULTING; skrócona nazwa: JKK
- John L Morgan & Sons
- JOHN LAZI, AMERYKAŃSKA AKADEMIA
- John Leadbetter Painting & Decorating
- John Leahy Electrical Contractor