Nathan W. Brown (15 January 1819 ‒ 4 March 1893) was a career officer in the United States Army.

A Union Army veteran of the American Civil War, Brown attained the rank of brigadier general.

[1] He then served at Fort Smith, Arkansas; when the post was evacuated at the start of the American Civil War in April 1861, Brown was assigned to paymaster duties with the Department of the Missouri.

[1] In 1869, he was assigned as chief paymaster of the Pay Department's New York City depot.

[5] In 1880, he was promoted to brigadier general and appointed as Paymaster-General of the United States Army.