William J. Biggy (January 23, 1859 – November 30, 1908) was the San Francisco Chief of Police from 1907 to 1908.

1) The San Francisco Examiner published on June 15, 1908 the following news: To curtail speeders, San Francisco Police Chief William Biggy orders his mounted officers to lasso drivers who break the speed law and ignore the demand to "halt."

During the San Francisco graft prosecutions, Biggy was appointed Elisor by the court to hold Abraham Ruef in custody, which lasted more than a year, first in the temporary "little" Saint Francis Hotel and later in a house at 2849 Fillmore Street, after the sheriff and the coroner were disqualified.

After the non-fatal shooting of special prosecutor Francis J. Heney by an excused juror named Morris Haas, embarrassed by Heney as an ex-con during jury selection in the bribery trial of Abe Ruef, Chief of Police Biggy endured public criticism for negligence for the fact that Haas had a small derringer and committed suicide under police watch.

Walton Bean: Boss Ruef's San Francisco - UC Press 1952 CA