The 1929 Wall Street crash day on October 29 was called Black Tuesday.
Black Tuesday was the fourth major day of selling in the Wall Street Crash of 1929. About 16 million shares changed hands on the New York Stock Exchange, a volume record at the time. Prices fell sharply, and the day became the most famous date associated with the collapse of the late-1920s stock-market boom.
The crash did not happen on a single day. Heavy selling began on Black Thursday, October 24, and continued through Black Monday, October 28, before the dramatic losses of Black Tuesday. The Dow Jones Industrial Average had reached a peak in September 1929 and then declined for several years.
The crash helped deepen the economic crisis that became the Great Depression, although historians do not treat it as the sole cause. Falling investment, banking problems, debt, reduced demand, and policy responses all shaped what followed. Black Tuesday is therefore best understood as a landmark within a longer financial collapse.