The Crowd: A Study of the Popular Mind is a book authored by Gustave Le Bon that was first published in 1895. In the book, Le Bon claims that there are several characteristics of crowd psychology: "impulsiveness, irritability, incapacity to reason, the absence of judgement of the critical spirit, the exaggeration of sentiments, and others...".

Gustave Le Bon (7 May 1841 – 13 December 1931) was a French social psychologist, sociologist, anthropologist, inventor, and amateur physicist. He is best known for his 1895 work The Crowd: A Study of the Popular Mind. His writings incorporate theories of national traits, racial and male superiority, herd behavior and crowd psychology.