Robert Henry Newell (December 13, 1836 – July 1901) was a 19th-century American humorist. During the U.S. Civil War, Newell wrote a series of satirical articles using the pseudonym Orpheus C. Kerr, commenting on the war and contemporary society. His articles appeared weekly in the New York Sunday Mercury, where he was the literary editor until 1862, and were published in a series of books. Among other newspapers he worked at, from 1869 to 1874 he wrote for the New York World. From approximately 1862 to 1865, he was married to famous actress Adah Isaacs Menken.