Reuben Osborne Moon (July 22, 1847 – October 26, 1919) was an American educator and lawyer who served five terms as a Republican member of the U.S. House of Representatives for Pennsylvania from 1903 to 1913.

He became a professor in the National School of Oratory, and engaged in lecturing and studied law.

[1] He served as Chairman, Committee on Revision of the Laws in the 59th through 61st Congresses.

[2] He is interred at West Laurel Hill Cemetery in Bala Cynwyd, PA.

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