Nippon Idemitsu Kogyo Co.
- Country: Japan
- Type: Commercial
- Website: www.idemitsu.com
- Update: 05-02
(Idemitsu Kosan) is Japan's second largest oil company after JX Holdings, founded in 1911 and headquartered in Tokyo, Japan. Idemitsu Kosan was ranked 215th in the 2013 Fortune 500 ranking.
