Politics and Business magazines
- Jamba Juice Company
- James Avery Craftsman, Inc.
- James Beattie plc
- James Hardie Industries N.V.
- James Original Coney Island Inc.
- James Purdey & Sons Limited
- James River Corporation of Virginia
- JanSport, Inc.
- Janssen Pharmaceutica N.V.
- Janus Capital Group Inc.
- Japan Air Lines Company Ltd.
- Japan Airlines Company, Ltd.
- Japan Broadcasting Corporation (Nippon Hoso Kyokai)
- Japan Leasing Corporation
- Japan Pulp and Paper Company Limited
- Jardine Cycle & Carriage Ltd.
- Jardine Matheson Holdings Limited
- Jardine Matheson Holdings Ltd.
- Jarvis plc
- Jason Incorporated