ORLEN S.A. is a Polish multinational energy and fuel corporation based in Plock, Poland. It is the largest company in Central and Eastern Europe by revenue, operating in oil refining, petrol retailing, natural gas trading, and power generation. The company serves over 100 million customers in more than 100 countries and employs over 67,800 people.

Founded as Polski Koncern Naftowy Orlen, ORLEN is publicly traded on the Warsaw Stock Exchange, with the Polish state holding a significant stake. The company owns over 3,400 service stations across several countries, including Poland, the Czech Republic, and Germany. ORLEN's operations cover the entire oil and gas value chain, from upstream exploration and production to downstream refining and distribution. It is also focused on sustainability, investing in low-emission technologies and renewable energy sources as part of its Strategy 2035.