Walden (also known as Life in the Woods) by Henry David Thoreau is one of the best-known non-fiction books written by an American. Published in 1854, it details Thoreau's life for two years and two months in second-growth forest around the shores of Walden Pond, not far from his friends and family in Concord, Massachusetts. Walden was written so that the stay appears to be a year, with expressed seasonal divisions. Thoreau called it an experiment in simple living.

Walden is neither a novel nor a true autobiography, but a social critique of the Western World, with each chapter heralding some aspect of humanity that needed to be either renounced or praised.