PTT Public Company Limited or simply PTT (Thai: ปตท) is a Thai state-owned SET-listed oil and gas company. Formerly known as the Petroleum Authority of Thailand, it owns extensive submarine gas pipelines in the Gulf of Thailand, a network of LPG terminals throughout the kingdom, and is involved in electricity generation, petrochemical products, oil and gas exploration and production, and gasoline retailing businesses.
Affiliated companies include PTT Exploration and Production, PTT Global Chemical, PTT Asia Pacific Mining, and PTT Green Energy.
PTT is one of the largest corporations in the country and also the only company from Thailand listed in Fortune Global 500 companies. The company ranks 81st among top 500 on the Fortune 500, and 180 on the Forbes 2000.