Marland Oil Company was an American oil company founded in 1920 by E.W. Marland in Ponca City, Oklahoma. The company played a significant role in the early development of the oil industry in the United States, focusing on exploration and production of oil and gas. In 1929, Marland Oil Company became a major player in the industry when it merged with the Continental Oil Company, forming what is now known as ConocoPhillips. The company was known for its innovative practices and contributions to the growth of the oil sector during the early 20th century.