The Enron scandal, revealed in October 2001, eventually led to the bankruptcy of the Enron Corporation, an American energy company based in Houston, Texas, and the de facto dissolution of Arthur Andersen, which was one of the five largest audit and accountancy partnerships in the world. In addition to being the largest bankruptcy reorganization in American history at that time, Enron was attributed as the biggest audit failure.

Enron was formed in 1985 by Kenneth Lay after merging Houston Natural Gas and InterNorth. Several years later, when Jeffrey Skilling was hired, he developed a staff of executives that, by the use of accounting loopholes, special purpose entities, and poor financial reporting, were able to hide billions of dollars in debt from failed deals and projects. Chief Financial Officer Andrew Fastow and other executives not only misled Enron's board of directors and audit committee on high-risk accounting practices, but also pressured Andersen to ignore the issues.

Shareholders lost nearly $11 billion when Enron's stock price, which achieved a high of US $90 per share in mid-2000, plummeted to less than $1 by the end of November 2001. The U.S. Securities and Exchange Commission (SEC) began an investigation, and rival Houston competitor Dynegy offered to purchase the company at a very low price. The deal failed, and on December 2, 2001, Enron filed for bankruptcy under Chapter 11 of the United States Bankruptcy Code. Enron's $63.4 billion in assets made it the largest corporate bankruptcy in U.S. history until WorldCom's bankruptcy the next year.

Many executives at Enron were indicted for a variety of charges and were later sentenced to prison. Enron's auditor, Arthur Andersen, was found guilty in a United States District Court, but by the time the ruling was overturned at the U.S. Supreme Court, the company had lost the majority of its customers and had closed. Employees and shareholders received limited returns in lawsuits, despite losing billions in pensions and stock prices.

As a consequence of the scandal, new regulations and legislation were enacted to expand the accuracy of financial reporting for public companies. One piece of legislation, the Sarbanes-Oxley Act, increased penalties for destroying, altering, or fabricating records in federal investigations or for attempting to defraud shareholders. The act also increased the accountability of auditing firms to remain unbiased and independent of their clients.

Enron's collapse may have begun half a world away, in Dabhol India. Mired in controversy from the get-go, the Dabhol project was an economic and human rights disaster.