William Bradford Ross (December 4, 1873 – October 2, 1924) was an American politician who served as the 12th governor of Wyoming as a Democrat.

He met Nellie Davis Tayloe while she was visiting her relatives in Dover and after moving to Cheyenne, Wyoming in 1901 they married on September 11, 1902, in Omaha, Nebraska, and later had three children (twins James Ambrose and George Tayloe, Alfred Duff).

[1][2] From 1906 to 1907 he served as Laramie County's prosecuting attorney and in 1910 he unsuccessfully ran for Wyoming's at-large congressional seat.

On September 23, 1924, he gave a speech in favor of a severance tax constitutional amendment in Laramie and while being driven home became sick.

[4] Secretary of State Frank Lucas served as acting governor for three months until a special election was held where Ross's wife, Nellie Tayloe Ross, won and became the first female governor in the United States.