Daniel Clarence Quinn (October 11, 1935 – February 17, 2018) was an American author (primarily, novelist and fabulist), cultural critic, and publisher of educational texts, best known for his novel Ishmael, which won the Turner Tomorrow Fellowship Award in 1991 and was published the following year. Quinn's ideas are popularly associated with environmentalism, though he criticized this term for portraying the environment as separate from human life, thus creating a false dichotomy, and the environmental movement as misguided and ultimately ineffective. Instead, Quinn referred to his philosophy as "new tribalism".

Daniel Quinn was born in Omaha, Nebraska, where he graduated from Creighton Preparatory School. He went on to study at Saint Louis University, at the University of Vienna, Austria, through IES Abroad, and at Loyola University, receiving a bachelor's degree in English cum laude in 1957. He delayed part of this university education, however, while a postulant at the Abbey of Our Lady of Gethsemani in Bardstown, Kentucky, where he hoped to become a Trappist monk; however his spiritual director, Thomas Merton, prematurely ended Quinn's postulancy. Quinn went into publishing, abandoned his Catholic faith, and married twice unsuccessfully, before marrying Rennie MacKay Quinn, his third and final wife of 42 years.

In 1975, Quinn left his career as a publisher to become a freelance writer. He is best known for his book Ishmael (1992), which won the Turner Tomorrow Fellowship Award in 1991. Several judges disputed giving the entire $500,000 award to Quinn for Ishmael, rather than dividing the money among several authors, though judge Ray Bradbury, for one, supported the decision. Ishmael became the first of a loose trilogy of novels by Quinn, including The Story of B and My Ishmael, all of which brought increasing fame to Quinn throughout the 1990s. He became a well-known author to followers of the environmental, simple living, and anarchist movements, although he did not strongly self-identify with any of these.

Quinn traveled widely to lecture and discuss his books. While response to Ishmael was mostly very positive, Quinn's ideas have inspired the most controversy with a claim mentioned in Ishmael but made much more forcefully in The Story of B's Appendix that the total human population grows and shrinks according to food availability and with the catastrophic real-world conclusions he draws from this.

In 1998, Quinn collaborated with environmental biologist Alan D. Thornhill in producing Food Production and Population Growth, a video elaborating in-depth the science behind the ideas he describes in his fiction.

Quinn's book Tales of Adam was released in 2005 after a long bankruptcy scuffle with its initial publisher. It is designed to be a look through the animist's eyes in seven short tales; Quinn first explores the idea of animism as the original worldwide religion and as his own dogma-free belief system in The Story of B and his autobiography, Providence: The Story of a Fifty-Year Vision Quest.

In February 2018, Quinn died of aspiration pneumonia in hospice care.

Daniel Quinn was largely a fiction writer who explored the culturally-biased world-view ("mythology", in his terms) driving modern civilization and the destruction of the natural world. He sought to recognize and criticize some of civilization's most unchallenged "myths" or memes, which he considered to include the following: that the Earth was made especially for humans, so humans are destined to conquer and rule it; that humans are innately and inevitably flawed; that humans are separate from and superior to nature (which Quinn called "the most dangerous idea in existence"); and that all humans must be made to live according to some one right way.