John Antonio Moroso (1874–1957) was an American author.
Moroso was born into an Italian-American family, possibly in South Carolina. During the 1910s he wrote short stories for Collier's Weekly and other major publications. He also contributed his writings to the "American Boy Adventure Stories," a series of short stories by a variety of authors. While working in New York City he became a friend of the poet, Joyce Kilmer.
In 1923 Moroso wrote a story about life in an east side New York City ghetto titled The Stumbling Herd. In 1934 he published Black Chalice and two years later one of his best-known works, Nobody's Buddy. This novel about a boy and his dog originated as a short story called "Buddy and Waffles" published in the August 1915 issue of Ladies' Home Journal.
For a time, Moroso served as president of the corporation that published the Greenville Daily News in Greenville, South Carolina.