James Hervey Loomis (June 4, 1823, Attica, Wyoming County, New York – November 3, 1914, Boonton, Morris County, New Jersey) was an American merchant, banker and politician from New York.
He attended the common schools and Attica Academy.
In 1852, he opened a hardware store, and later also engaged in banking.
He was Supervisor of the Town of Attica for some time, and Assessor of Internal Revenue from 1869 to 1871.
He was buried at the Forest Hill Cemetery in Attica.