Banco Ambrosiano was an Italian bank that was established in 1896 and collapsed in 1982. The Vatican-based Institute for the Works of Religion, commonly known as the Vatican Bank, was Banco Ambrosiano's main shareholder. The Vatican Bank was accused of funnelling covert United States funds to the Polish trade union Solidarity and to the Nicaraguan Contras through Banco Ambrosiano.

The Institute for the Works of Religion, commonly known as the Vatican Bank, is a financial institution that is situated inside Vatican City and run by a Board of Superintendence, which reports to a Commission of Cardinals and the Pope. It is not a private bank, as there are no owners or shareholders; it has been established in the form of a juridical canonical foundation, pursuant to its statutes. Since 9 July 2014, its president is Jean-Baptiste de Franssu. The IOR is regulated by the Vatican's financial supervisory body ASIF.