Robert Gruntal Nathan (January 2, 1894 – May 25, 1985) was an American novelist and poet.

Nathan was born into a prominent New York family. He was educated in the United States and Switzerland and attended Harvard University for several years beginning in 1912. It was there that he began writing short fiction and poetry. However, he never graduated, choosing instead to drop out and take a job at an advertising firm to support his family (he married while a junior at Harvard). It was while working in 1919 that he wrote his first novel—the semi-autobiographical work Peter Kindred—which was a critical failure. But his luck soon changed during the 1920s, when he wrote seven more novels, including The Bishop's Wife, which was later made into a successful film starring Cary Grant, David Niven, and Loretta Young. It was also remade in 1996 as The Preacher's Wife starring Denzel Washington, Whitney Houston, and Courtney B. Vance.

There is no information about the novel available on Wikipedia at this time, but here is a link to the film entry.