William Barclay Harding (November 16, 1906 – June 30, 1967)[1] was an American financier who served as chairman of the board of Smith, Barney and Co. until his death in 1967.

[6][7] His grandfather, a former member of his great-grandfather's firm, Jay Cooke & Company,[8] founded Charles D. Barney & Co. in 1873 before retiring in 1907.

[10] At the time of his death, he also served a director of Electric Auto Light Co. of Toledo, Ohio.

[14] Before they separated in 1941, they were the parents of two sons and a daughter:[2] After they were divorced on June 28, 1943, in Nevada,[24] Constance remarried George Lavan Weissman (1916-1985) and Harding remarried Mary Newbold (née Reed) Dodge, the daughter of Latham Reed and former wife of Marshall J.

[10] A prominent philanthropist, he served as president of the New Jersey State Home for Boys in Jamesburg and a member of the board of director of the Allenwood Sanatorium.