CITGO Petroleum Corporation is a U.S.-based integrated energy company with a history that dates back to 1910. Originally founded as Cities Service Company, it began by supplying gas and electric utility services before shifting its focus entirely to oil and gas activities by 1958. CITGO was incorporated in 1983 and has since become a leading gasoline retailer in the United States, with extensive refining and marketing operations.

The company specializes in refining, marketing, and transporting petroleum products, including gasoline, diesel, jet fuel, and lubricants. CITGO supplies fuel to retail outlets, branded distributors, and commercial customers. It also engages in joint ventures to enhance its refining capabilities. With a commitment to community engagement, CITGO blends its business operations with philanthropic efforts to improve the lives of people in the communities it serves.