Waldo David Frank (1889–1967) was an American novelist, essayist, critic, and cultural thinker known for his writings on American identity, society, literature, and spirituality. He traveled extensively throughout the Americas and explored the connections between culture, history, and human experience. Frank wrote numerous novels, essays, and works of criticism that influenced intellectual discussions during the twentieth century. His writings reflected a deep interest in social change, cultural understanding, and the search for meaning in modern life.