Sidney Miller Ballou (October 24, 1870 – October 29, 1929)[1][2] was an associate justice of the Supreme Court of Hawaii from August 15, 1907 to May 6, 1909,[3] and author of various pamphlets on scientific, naval, legal, and economic subjects.

[5] Ballou compiled the civic laws of Hawaii, and in 1907 was appointed as an associate justice of the Supreme Court of Hawaii, to succeed Alfred S. Hartwell, who had been elevated to Chief Justice of that court.

Ballou resigned his judgeship in 1911 to resume the private practice of law, where he was retained as the representative of the American sugar companies in Hawaii, "a post as important as that of senator" due to the central importance of that industry to the territory.

[5] Ballou also represented Liliuokalani, former Queen of the Kingdom of Hawaii, in a claim against the United States.

[5] Ballou married Lucia Burnett, a native of California, on July 27, 1907.