The financial crisis of 2007–2008 was a major financial crisis, the worst of its kind since the Great Depression in the 1930s. Until the COVID-19 recession, the financial crisis of 2007-2008 is considered the worst financial crisis during the 21st century.

In September 2008 many large financial firms in the United States collapsed, merged, or went under conservatorship (a person is assigned to manage a company when it cannot manage itself). The factors that led to the crisis were reported in business journals many months before September 2008.