Isaac Sawyer Belcher (February 27, 1825 – November 30, 1898) was an American attorney and an associate justice of the Supreme Court of California from March 4, 1872, to January 5, 1874.

From 1856 to 1857, Belcher served as District attorney for Yuba County, California having run on the American Party or Know Nothings ticket.

[11] In June 1878, Belcher was nominated by the Democratic Party and served as a member of the convention in September 1878 which framed the existing Constitution of California.

[12][13] In 1879, Belcher ran for another term when all seats of the Supreme Court were up for election due to the new constitution.

[27] In 1893, Edward was appointed by Governor Henry Markham as a judge of the San Francisco County Superior Court.