Environment-Related Prizes and Awards Won by Honda
| Name of Prize | Sponsor | Prize Winner | Date of Award |
| Received the Technological Development Award at the 54th Society of Automobile Engineers of Japan Awards for the development of hybrid NV control technology for variable cylinder engines. | The Society of Automobile Engineers of Japan | Honda R&D Co., Ltd. | May 2004 |
| Received the Fifth Saitama Environment Award | Saitama Prefecture Saitama Environmental Promotion Council Television Saitama |
Honda Motor Co., Ltd., Saitama Factory |
June 2004 |
| Received the Fiscal 2004 Grand Award for Best Technology for the ECOWILL system, which adopts Honda’s compact household cogeneration unit | The Japan Gas Association | Honda Motor Co., Ltd. | June 2004 |
| Received an award from the director general of the Agency for Natural Resources and Energy at the Fiscal 2004 Energy-Saving Grand Prix for the Smart Dio Z4 | The Energy Conservation Center, Japan |
Honda Motor Co., Ltd. | February 2005 |
| Received the Fiscal 2004 (31st) Iwatani Naoji Memorial Award for the ECOWILL system, which adopts Honda’s compact household cogeneration unit | The Iwatani Naoji Foundation | Honda Motor Co., Ltd. | March 2005 |
| Received a prize for excellence at the First Aichi Environmental Awards for the ECOWILL system, which adopts Honda’s compact household cogeneration unit | Aichi Prefecture | Honda Motor Co., Ltd. | March 2005 |
