Santander UK plc is a British bank, wholly owned by the Spanish Santander Group. Santander UK plc manages its affairs autonomously, with its own local management team, responsible solely for its performance.

Santander UK is one of the leading personal financial services companies in the United Kingdom, and one of the largest providers of mortgages and savings in the United Kingdom. The bank has circa 20,000 employees, 14 million active customers, 64 corporate business centres.

The bank, with its head office in Euston, London, was established on 11 January 2010, when Abbey National plc was combined with the savings business and branches of Bradford & Bingley plc, and renamed Santander UK plc. Alliance & Leicester plc merged into the renamed business in May 2010