The Bank of New York Mellon Corporation, commonly known as BNY Mellon, is an American banking and financial services corporation headquartered in New York City. The bank offers investment management, investment services, and wealth management services. BNY Mellon was formed from the merger of The Bank of New York and the Mellon Financial Corporation in 2007. It is the world's largest custodian bank and securities services company, with $1.8 trillion in assets under management and $45.7 trillion in assets under custody as of 2023. It is considered a systemically important bank by the Financial Stability Board.

Mellon Financial Corporation was an American investment firm which was once one of the world's largest money management firms. Based in Pittsburgh, Pennsylvania, it was in the business of institutional and high-net-worth individual asset management, including the Dreyfus family of mutual funds, business banking, and shareholder and investor services. On December 4, 2006, it announced a merger agreement with Bank of New York, to form BNY Mellon. After regulatory and shareholder approval, the banks completed the merger on July 2, 2007.