The Long Depression was a worldwide price recession, beginning in 1873 and running through the spring of 1879. It was the most severe in Europe and the United States, which had been experiencing strong economic growth fueled by the Second Industrial Revolution in the decade following the American Civil War. The episode was labeled the "Great Depression" at the time, and it held that designation until the Great Depression of the 1930s. Though a period of general deflation and a general contraction, it did not have the severe economic retrogression of the Great Depression.

It was most notable in Western Europe and North America, at least in part because reliable data from the period are most readily available in those parts of the world. The United Kingdom is often considered to have been the hardest hit; during this period it lost some of its large industrial lead over the economies of Continental Europe. While it was occurring, the view was prominent that the economy of the United Kingdom had been in continuous depression from 1873 to as late as 1896 and some texts refer to the period as the Great Depression of 1873–96.