Banking in Switzerland dates to the early 18th century through Switzerland's merchant trade and has, over the centuries, grown into a complex, regulated, and international industry. Banking is seen as emblematic of Switzerland. The country has a long history of banking secrecy and client confidentiality reaching back to the early 1700s. Starting as a way to protect wealthy European banking interests, Swiss banking secrecy was codified in 1934 with the passage of a landmark federal law, the Federal Act on Banks and Savings Banks. These laws, which were used to protect assets of persons being persecuted by Nazi authorities, have also been used by people and institutions seeking to illegally evade taxes, hide assets, or generally commit financial crime.

An offshore financial centre (OFC) is defined as a "country or jurisdiction that provides financial services to nonresidents on a scale that is incommensurate with the size and the financing of its domestic economy."