William Jefferson Hunsaker (1855–1933) was an American lawyer and politician from San Diego and later Los Angeles, California.

[4][6] Hunsaker next trained as a lawyer with Major Levi Chase and Albert C. Baker and was admitted to practice law in 1876.

On 27 February 1879, Hunsaker married Florence McFarland in San Diego and the couple moved to Tombstone, Arizona.

[7] In 1881, Hunsaker assisted his law partner, Thomas Fitch, in defending Wyatt Earp from murder charges resulting from the gunfight at the O.K.

[6][9] In 1887, Hunsaker ran for the newly reestablished office of mayor of San Diego, after 35 years of the formerly-bankrupt city being run by a board of trustees.

From 1893 to 1896, Hunsaker was counsel for the Atchison, Topeka and Santa Fe Railway,[17][18][19] but apparently maintained an outside practice as well, defending E. S. Babcock from bribery charges related to the Southern California Mountain Water Company.

[21] However Hunsaker remained largely independent — from 1896 to 1906, he chaired the Committee of One Hundred, a group of leading citizens who published non-partisan ballots for local elections.

[3] Will and Florence had five children: Mary Cameron (William Brill), twins Florence King and Lois, Rose Margaret (John Hamilton Lashbrooke, William Adam Steehler, Marshall Macy Hobson), and Daniel McFarland (Katherine Lyons).