Elisha Oscar Crosby (July 18, 1818 - June 25, 1895) was an American lawyer, politician and diplomat.

[2] As a state senator, he served as chair of the Judiciary Committee, and in that capacity prepared the committee report resulting in the enactment of a reception statute by which the newly formed state of California adopted the common law as the basis for its legal system.

[3] He served as the United States Minister Resident to Guatemala from 1861 to 1864.

[2] By the 1870s, he settled in Alameda, California, where he became a justice of peace.

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