A Ponzi scheme is a form of fraud that lures investors and pays profits to earlier investors with funds from more recent investors. Named after Italian businessman Charles Ponzi, this type of scheme misleads investors by either falsely suggesting that profits are derived from legitimate business activities, or by exaggerating the extent and profitability of the legitimate business activities, leveraging new investments to fabricate or supplement these profits. A Ponzi scheme can maintain the illusion of a sustainable business as long as investors continue to contribute new funds, and as long as most of the investors do not demand full repayment or lose faith in the non-existent assets they are purported to own.

Charles Ponzi was an Italian swindler and con artist who operated in the U.S. and Canada. His aliases included Charles Ponci, Carlo, and Charles P. Bianchi.