|Birth||10 October 1854|
|Death||21 April 1930|
William Arthur Sloane (October 10, 1854 - April 21, 1930) was an Associate Justice of the Supreme Court of California from December 15, 1920 to January 1923.
Born in Rockford, Illinois, to Hampton P. and Adeline Sloane, his family moved to Missouri, where he attended the public schools, and then attended Grinnell College, receiving an B.A. in 1877. He was admitted to the Missouri Bar in 1878, practicing law in Sedalia, and working for two years as editor of the "Eagle Times". He then moved to Carthage, where he was managing editor of the "Daily Banner" for four years.
In 1886, Sloane moved to San Diego, California, where he engaged in the practice of the law until 1888, when he was elected as a Justice of the Peace of San Diego Township. He held that office for four years, thereafter returning to the practice of the law in association with A. A. Sweet and Lewis R. Kirby. In 1898, Sloane formed a partnership with Judge Moses A. Luce, with whom he worked until 1911, when Governor Hiram Johnson appointed Sloane to the Superior Court of San Diego County. Sloane was re-elected to that office, which he held until January 1, 1919, when Governor William Stephens appointed him to the newly created Second Division of the Appellate Court, Second Appellate District. He resigned from the appellate court in April, 1920, effective May 3, 1920, to accept elevation to the California Supreme Court, filling a vacancy caused by the death of Associate Justice Henry A. Melvin. Sloane resigned from the bench in 1923, again returning to private practice. In 1930, when the Fourth Appellate District was created, Governor C. C. Young appointed Sloane to that court; however, Sloane became ill and died six months after taking office.
Sloane married Annie B. Kimball, of Vineland, New Jersey, on May 1, 1882, with whom he had three children.