John Rhoderic[1] McPherson (May 9, 1833 – October 8, 1897) was an American businessman, inventor, and Democratic politician who represented New Jersey in the United States Senate for three terms from 1877 to 1895.

An inventor, he devised or created improvements that enhanced sanitation and efficiency in slaughterhouses, many of which were later employed as industry standards.

During his Senate service, McPherson spent several terms as chairman of the Naval Affairs Committee.

[2][3] In Jersey City, McPherson became a prominent livestock dealer and slaughterhouse owner.

[2] As an inventor, McPherson designed or improved several devices and processes to promote efficient and sanitary slaughterhouse operations, many of which were adopted as meatpacking industry standards.

[2] McPherson's other business activities included serving as a director or officer of several banks, and president of Jersey City's People's Gas Light Company.

[9] After leaving the Senate, McPherson actively managed his livestock and meatpacking business, the Western Stockyard Company, from an office in New York City.

[3] He was buried in Oak Hill Cemetery in Washington, D.C.[13] McPherson sometimes used "MacPherson", the original Scottish spelling of his name, and his family grave marker is inscribed with the "Mac" prefix.

[22] The estate was settled in late 1902 with payments to Dr. Muir, Yale University, and members of the extended McPherson family.