Oliver Burr Jennings (June 3, 1825 – February 12, 1893) was an American businessman and one of the original stockholders in Standard Oil.

He set up a general mercantile store in San Francisco with Benjamin Brewster and amassed a considerable fortune by outfitting prospecting camps along the coast and around Sacramento.

Due to his close relationship with his wife's brother-in-law, William Avery Rockefeller, Jr., he became interested in the affairs of the Standard Oil Company.

Her younger sister, Almira Geraldine Goodsell, was the wife of Standard Oil co-founder William Rockefeller, Jr.[7] Together, Oliver and Esther had five children:[1] Jennings died in 1893 at his residence in New York City.

[17] and Anne Burr Auchincloss, who married Wilmarth S. Lewis and spent her fortune to setting up the Lewis Walpole Library at Yale University, devoted to the life and works of Horace Walpole, the builder of Strawberry Hill House.