The Banque Française et Italienne pour l'Amérique du Sud (lit. 'French and Italian Bank for South America', BFIAS), abbreviated from the late 1970s as Sudameris, was a bank headquartered in Paris that served markets in South America. Founded in 1910 and eventually disbanded in the early 2000s, it was controlled during most of that near-century by Banca Commerciale Italiana (BCI).

As of early 2025, the Sudameris brand survived with the group's respective former local operations in Colombia and Paraguay, respectively Banco GNB Sudameris and Sudameris Bank S.A.E.C.A. The latter became Paraguay's largest bank in 2023.

BCI sponsored the bank's creation with French partners on 19 May 1910, when the new venture took over the activities of the prior Banco Commerciale Italo-Brasiliano, established in 1900 in São Paulo and controlled by BCI since 1906. The context was France's ambition to develop its influence in South America, and BCI's desire to expand its access to the French financial market and leverage the rapid growth of Italian immigrant communities in South American countries. The initial ownership structure included BCI (43.3 percent), the Banque de Paris et des Pays-Bas (BPPB, 17.6 percent), Société Générale (13.2 percent), and others.

The bank was established from the outset at 12, rue Halévy, a prestigious building across street from the Palais Garnier, originally erected in 1863. It would remain there for close to a century, sometimes referred to by the address of another entrance to the same building at 4, rue Meyerbeer. In 2010 the former Sudameris banking hall there was repurposed to host an Apple Store.

After World War I, BCI became the bank's majority shareholder with 65 percent equity ownership. The bank's governance remained a matter of French-Italian compromise, however, with a French chairman and Italian chief executive based in Paris. By 1939, the bank had branches in Brazil (São Paulo, Rio de Janeiro, Santos, Bahia, Curitiba, Porto Alegre, Recife, plus 19 agencies in smaller areas), Argentina (Buenos Aires and Rosario), Chile (Santiago and Valparaíso), Colombia (Bogotá, Barranquilla and Medellín), and Uruguay (Montevideo).

During World War II, BCI and the BPPB moved some of the bank's general management from Paris to Buenos Aires, in order to allow their joint venture to claim neutrality in the conflict. These managers established a Directorate-General for South American Countries (Italian: direzione generale per i paesi sudamericani, known as DIGESUD). After France was invaded in June 1940, DIGESUD acted as head office of the South American operations.

Following the liberation of France, Charles de Gaulle froze Italian assets in the country. In 1947, however, the French government waived its right to reparations for war damages, provided that BCI would reduce its stake in the bank to less than half by selling the rest to French buyers. The Banque de l'Indochine subsequently became a shareholder, but BCI was again majority shareholder by 1948. That year, the bank restarted its activity in Brazil, which it had stopped in 1941.

In 1978-1979 the bank adopted the shortened name Sudameris and used it in its subsidiaries, e.g. Banco Sudameris Brasil, Banco Sudameris Paraguay, Banco Sudameris International de Panamá. Banco Sudameris reopened in Santiago (Chile) in 1979, and Banco Sudameris Colombia was created in 1982. The group, however, experienced financial stress during the 1980s.