William Kissam Vanderbilt I
- Born: 12 Dec 1849, New Dorp, Staten Island, Richmond County, New York, USA
- Marriage (1): Alva Erskine Smith in 1874
- Marriage (2): Ann Harriman Rutherford Sands in 1903
- Died: 22 Jul 1920, Paris, Īle-de-France, France at age 70 1
William married Alva Erskine Smith, daughter of Murray Forbes Smith and Phoebe Ann Desha, in 1874. (Alva Erskine Smith was born on 17 Jan 1853 in Mobile, , Alabama, USA and died on 26 Jan 1933 in Paris, Īle-de-France, France.)
William next married Ann Harriman Rutherford Sands in 1903.