The Expression of the Emotions in Man and Animals is a classic work originally published in 1872 and written by naturalist Charles Darwin. This title is about how animals and humans are able to express their emotions. This book played an important role as a follow up to Charles Darwins' 1871 book, The Descent of Man, and addresses questions on the origins of humans and human psychology throug his theory of natural selection.

The Expression of the Emotions in Man and Animals is a book by Charles Darwin, published in 1872, concerning genetically determined aspects of behaviour.In this book, Darwin seeks to trace the animal origins of human characteristics, such as the pursing of the lips in concentration and the tightening of the muscles around the eyes in anger and efforts of memory. The Expression of the Emotions is also an important landmark in the history of book illustration.

Charles Robert Darwin (12 February 1809 – 19 April 1882) was an English naturalist and geologist, best known for his contributions to evolutionary theory. He established that all species of life have descended over time from common ancestors, and in a joint publication with Alfred Russel Wallace introduced his scientific theory that this branching pattern of evolution resulted from a process that he called natural selection, in which the struggle for existence has a similar effect to the artificial selection involved in selective breeding.