The Magnolia Petroleum Company was an early twentieth century petroleum company based in Texas.

The company was founded on April 24, 1911 as a consolidation of several earlier companies. Standard Oil of New York (Socony) exchanged its stock for all of the Magnolia stock in December 1925.

Though it continued to operate as an affiliate of Socony. Later in 1959, Magnolia was fully incorporated into the Mobil division of Socony.