The National Bank of Guinea-Bissau (Portuguese: Banco Nacional da Guiné-Bissau or BNG) was the central bank of Guinea-Bissau from February 1975 until May 1997, when Guinea-Bissau joined the Central Bank of West African States.

[1] At independence in February 1975, Guinea-Bissau nationalized the Banco Nacional Ultramarino, Portuguese bank's branch, and transformed it into the country's central bank.

The currency, Portuguese escudo, was replaced with Guinea-Bissau peso.

In May 1997 Guinea-Bissau joined the francophone West African Monetary Union Union Économique et Monétaire Ouest-Africaine (UEMOA).

Consequently, National Bank of Guinea-Bissau was converted as a national branch of Central Bank of West African States (BCEAO), and national currency Guinea Bissau peso was replaced by West African CFA franc.