James Jewett Stillman (June 9, 1850 – March 15, 1918) was an American businessman who invested in land, banking, and railroads in New York, Texas, and Mexico.

[1] He forged alliances with the Rockefeller family, Standard Oil and Kuhn, Loeb & Co. to lay a foundation that made it, arguably, "the greatest bank in the Western Hemisphere.

In 1876, Stillman supported Porfirio Díaz's overthrow of the government of Mexico by the Revolution of Tuxtepec.

[1] He died on March 15, 1918, at his home at 9 East 72nd St (also called The Henry T Sloane House) [1] His funeral was at St. Bartholomew's Episcopal Church, New York.

[7] Together they had: Stillman was an intimate friend of both James O. Bloss and John William Sterling.

After Sterling's death it was learned that he had appointed his long time intimate companion, Bloss, one of the executors.