Banco Santander S.A. doing business as Santander Group, is a Spanish multinational financial services company based in Madrid and Santander in Spain. Additionally, Santander maintains a presence in all global financial centres as the 19th-largest banking institution in the world. Although known for its European banking operations, it has extended operations across North and South America, and more recently in continental Asia. It is considered a systemically important bank by the Financial Stability Board.

Santander is the capital of the autonomous community of Cantabria, Spain. It has a population of 172,000 (2017). It is a port city located in the northern coast of the Iberian Peninsula, facing the Cantabrian Sea.