John Phillips Marquand (November 10, 1893 – July 16, 1960) was an American writer. Originally best known for his Mr. Moto spy stories, he achieved popular success and critical respect for his satirical novels, winning a Pulitzer Prize for The Late George Apley in 1938. One of his abiding themes was the confining nature of life in America's upper class and among those who aspired to join it. Marquand treated those whose lives were bound by these unwritten codes with a characteristic mix of respect and satire.

His son John P. Marquand, Jr. (died 1995) was also a novelist (using the pen name John Phillips).

Youth and early adulthood

Marquand was a scion of an old Newburyport, Massachusetts, family. He was a great-nephew of 19th-century writer Margaret Fuller and a cousin of Buckminster Fuller, who gained fame in the 20th century as the inventor of the geodesic dome. Marquand was born in Wilmington, Delaware, and grew up in the New York suburbs. When financial reverses broke up the family's comfortable household, he was sent to Newburyport, Massachusetts, where he was raised by his eccentric aunts, who lived in a crumbling Federal Period mansion surrounded by remnants of the family's vanished glory. (Marquand's ancestors had been successful merchants in the Revolutionary period; Margaret Fuller and other aunts had been actively involved with the Transcendentalist and abolitionist movements.)