The National Bank of Detroit (NBD), later renamed NBD Bank, was a bank that operated mostly in the Midwestern United States. Following its merger with First National Bank of Chicago, the bank was ultimately acquired and merged into Bank One, at which point the NBD name was discontinued. Today, what was once NBD is owned by JPMorgan Chase & Co.

First Chicago Bank was a Chicago-based retail and commercial bank tracing its roots to 1863, when it received one of the first charters under the then new National Bank Act. Over the years, the bank operated under several names including The First National Bank of Chicago and First Chicago NBD. In 1998, First Chicago NBD merged with Banc One Corporation to form Bank One Corporation, today a part of Chase.