What is the largest oil company in Thailand?

Written by Editorial Team | Last Updated: August 2026

PTT Public Company Limited is the largest state-owned oil, gas, and petrochemical conglomerate in Thailand. Dominating the national energy sector, PTT manages extensive offshore natural gas fields, massive pipeline networks, and major refining subsidiaries such as Thai Oil. The corporation oversees the entire hydrocarbon value chain, driving domestic industrial growth and expanding clean energy investments across Southeast Asia.

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Thailand gets the majority of its total oil supply through international crude imports, supplementing its limited domestic production fields in the Gulf of Thailand and onshore reserves.

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