O Pioneers! is Willa Cather's first great novel. It is the classic American story of pioneer life as embodied by one remarkable woman and her singular devotion to the land.

O Pioneers! is a 1913 novel by American author Willa Cather, written while she was living in New York. It is the first novel of her Great Plains trilogy, followed by The Song of the Lark (1915) and My Ántonia (1918).

Willa Sibert Cather (December 7, 1873 – April 24, 1947) was an American author who achieved recognition for her novels of frontier life on the Great Plains, in works such as O Pioneers!, My Ántonia, and The Song of the Lark. In 1923 she was awarded the Pulitzer Prize for One of Ours (1924), a novel set during World War I.