Oil and Natural Gas Corporation Limited is a multinational oil and gas company headquartered in Dehradun, Uttarakhand, India

Here as per your demand I am providing you list of the ONGC Group of Companies other than ONGC Mittal Energy Services Limited (OMESL)

ONGC Videsh Limited (OVL)

Mangalore Refinery and Petrochemicals Limited (MRPL)

ONGC Nile Ganga BV (ONG BV)

ONGC Mittal Energy Limted (OMEL)

ONGC Tripura Power Company Pvt.Ltd. (OTPCL)

Kakinada Refinery & Petrochemicals Limited (KRPL)

Kakinada SEZ Limited

Mangalore SEZ Limited

Dahej SEZ Limited

Rajasthan Refinery Limited (RRL)

Institutes:

1. Keshava Dev Malaviya Institute of Petroleum Exploration (KDMIPE), Dehradun

2. Institute of Drilling Technology (IDT), Dehradun

3. Institute of Reservoir Studies, Ahmedabad

4. Institute of Oil & Gas Production Technology, Navi Mumbai

5. Institute of Engineering & Ocean Technology, Navi Mumbai

6. Geo- data Processing & Interpretation Center (GEOPIC), Dehradun

7. ONGC Academy , Dehradun

8. Institute of Petroleum Safety, Health & Environment Management, Goa .

9. Institute of Biotechnology & Geotectonics Studies, Jorhat

10. School of Maintenance Practices, Vadodara

11. Regional Training Institutes, Navi Mumbai, Chennai, Sivasagar & Vadodara.