Jefferson Borden Harriman (September 20, 1864 – December 2, 1914) was a New York financier and member of the Gilded Age's "hunting set".

He was best known as the supportive husband of Florence Jaffray Harriman, a socialite who became a progressive social activist and (after his death) a United States Ambassador to Norway during the administration of President Franklin D. Roosevelt.

[3] Later that year, he and his siblings successfully petitioned a New York court to declare their 70-year-old father incapable to manage his affairs due to senile dementia.

[6][7] Once open, the owners added further innovations—a separate branch reserved for women customers,[8] and an automobile "safe on wheels" that would pick up cash and valuables from depositors' homes.

[17] After leaving Karlsbad on the last train crossing the frontier through Germany to France,[18] they eventually returned, without their belongings, to New York on an armed British vessel, the RMS Adriatic.

[17] On November 13, 1889, he married nineteen-year-old Florence Jaffray Hurst, daughter of shipping executive (and former Civil War Union blockade runner) F.W.J.

[1] The list of attendees at their wedding included past and future president Grover Cleveland, railroad tycoons Cornelius Vanderbilt and Edward Harriman, John Jacob Astor IV, and J. P.