PT Pertamina Hulu Mahakam (PHM) is a subsidiary of Indonesia's state-owned energy company, PT Pertamina (Persero). It specializes in upstream oil and natural gas exploration and production, primarily operating in the Mahakam Block in East Kalimantan. PHM plays a significant role in managing oil and gas assets in the region as part of Pertamina Hulu Indonesia.

The company focuses on both offshore and onshore operations, with key projects like the Offshore Field Development Project (OPLL-3B) aimed at optimizing production through the drilling and connection of multiple wells. In 2024, PHM plans to launch three sustainable projects, which are expected to significantly increase gas and oil production. PHM employs over 2,500 skilled workers and is committed to safety, environmental responsibility, and community development. Its corporate values emphasize trustworthiness, competence, and collaboration, supporting its vision of becoming a world-class oil and gas company.