In The Godfather Part III, what is the Vatican-linked bank called?

In The Godfather Part III, the Vatican-linked bank is called Banco Immobiliare.

Michael Corleone seeks legitimacy by expanding beyond organized crime and arranging a major deal involving Immobiliare, an international real-estate company. The transaction brings him into contact with Vatican financial officials and with Archbishop Gilday, whose troubled institution is connected to the bank.

The fictional Banco Immobiliare is central to the film’s plot because the business deal appears to offer Michael a respectable future while also exposing corruption inside the financial and religious systems surrounding it. The story then becomes entangled with betrayal, the death of Pope John Paul I, and the struggle over control of Immobiliare.

The name is sometimes confused with Banco Ambrosiano, the real Italian bank whose 1982 collapse and connections to the Vatican inspired elements of the film. Banco Immobiliare is the fictional institution named in The Godfather Part III, while Banco Ambrosiano is the historical counterpart often discussed in connection with its background.