Mr. Moto is a fictional Japanese secret agent created by the American author John P. Marquand. He appeared in six novels by Marquand published between 1935 and 1957. Marquand initially created the character for the Saturday Evening Post, which was seeking stories with an Asian hero after the death of Charlie Chan's creator Earl Derr Biggers.

John Phillips Marquand 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.