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John William Arnold (February 14, 1842 – 1900) was an American politician from New York. Coming with his family to Lockport, Illinois, Arnold worked in his father's store until the outbreak of the Civil War. Arnold served with the 4th Regiment Illinois Volunteer Cavalry and the Chicago Mercantile Independent Battery Light Artillery, eventually being captured and imprisoned at Camp Ford, Texas. After the war he ran his father's store and was elected to two terms in the Illinois Senate. He was later named a United States Marshal.