Santander UK
| Head office in London | |
| Formerly | Abbey National plc (1988–2010) | 
|---|---|
| Company type | Public limited company | 
| Industry | Finance and Insurance | 
| Predecessor | |
| Founded | 11 January 2010 | 
| Headquarters | London, England, UK | 
| Key people | Mike Regnier (CEO) | 
| Products | Financial services | 
| £4.956 billion (2022) | |
| £1.394 billion (2022) | |
| Total assets | £285.2 billion (2022) | 
| Number of employees | 18,000 (2025) | 
| Parent | Santander Group | 
| Divisions | 
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| Subsidiaries | 
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| Website | santander | 
Santander UK plc (UK: /ˌsæntənˈdɛər, -tæn-/, US: /ˌsɑːntɑːnˈdɛər/) is a British bank, wholly owned by Banco Santander, a Spanish bank. 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. As of May 2025, the bank has 18,000 employees and 14 million active customers, 64 corporate business centres.
The bank, with its head office in London's Regent's Place, 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.