| Avi-Oil India Pvt. Ltd. | Speciality lubricants | NYCO SA, France & Balmer Lawrie & Co. Ltd. |
| Delhi Aviation Fuel Facility Private Limited | Setting up and operation of Aviation Fuel Facility at Delhi Airport. | DIAL & BPCL |
| Green Gas Ltd. | City Gas distribution | GAIL (India) Ltd. |
| GSPL India Transco Ltd. | Setting up of Natural Gas Pipelines | GSPL, HPCL, BPCL |
| GSPL India Gasnet Ltd. | Setting up of Natural Gas Pipelines | GSPL, HPCL, BPCL |
| IOT Infrastructure & Energy Services Ltd. | Terminalling services | Oiltanking GmbH, Germany. |
| IndianOil Adani Gas Pvt. Ltd. | City Gas distribution | Adani Gas Ltd. |
| IndianOil Petronas Pvt. Ltd. | Terminalling services and parallel marketing of LPG | Petronas, Malaysia. |
| IndianOil Skytanking Pvt. Ltd. | Aviation fuel facility projects | Skytanking GmbH, Germany. |
| Indian Synthetic Rubber Pvt. Limited | Manufacturing of Styrene Butadiene Rubber at Panipat | Trimurti Holding Corporation |
| Kochi Salem Pipelines Private Limited | Laying pipeline for transport of LPG from Kochi to Salem | BPCL |
| Lubrizol India Pvt. Ltd. | Lube Additives | Lubrizol Inc., USA |
| Mumbai Aviation Fuel Farm Facility Pvt. Ltd. | Setting up common user integrated aviation fuel infrastructure. | BPCL, HPCL & MIAL |
| NPCIL - IndianOil Nuclear Energy Corporation Limited | For setting up Nuclear Power Plant | Nuclear Power Corporation of India limited |
| Petronet LNG Ltd. | LNG Imports/distribution | BPCL, ONGC and GAIL |
| Suntera Nigeria 205 Limited | Oil exploration activities. | Oil India Ltd. & Suntera Resources Ltd., Cyprus |
| IndianOil LNG Private Limited | LNG terminalling Services | IDFC Alternatives Limited & ICICI Bank Ltd |
| Hindustan Urvarak and Rasayan Limited | Revival of three Fertilizer plants at Gorakhpur, Sindri of FCIL and Barauni of HFCL | CIL, NTPC, FCIL and HFCL |
| Ratnagiri Refinery and Petrochemicals Limited | West Coast Refinery and Petrochemical Project with 60 MMTPA capacity in Maharashtra | BPCL & HPCL |
| Note : Apart from above IOCL have 5 other JV Companies namely Petronet India Limited, Petronet VK, Limited, Petronet CI Limited, IndianOil Panipat Power Consortium Limited and IndianOil Ruchi Biofuels LLP. Provision for Diminution in full value of Investment have been made and IndianOil has decided to exit from the Company as the partners have not found the joint venture viable in present business climate. |