John Henry Ketcham (December 21, 1832 – November 4, 1906) was a United States representative from New York for over 33 years.

John H. Ketcham was born in Dover Plains, New York on December 21, 1832.

With the outbreak of the American Civil War, he enlisted in the Union Army and was appointed as colonel of the 150th New York Volunteer Infantry, on October 11, 1862.

He served as chairman of the Committee on Expenditures in the Department of State (Fifty-seventh through Fifty-ninth Congresses).

[2] John Ketcham is buried in Valley View Cemetery in Dover Plains, New York.