Trustee Savings Bank (TSB) may refer to:

• First Trust Bank, Northern Ireland
• Lloyds-TSB Bank, United Kingdom
• Permanent TSB, Republic of Ireland

Historically the Trustee Savings Bank system was a (loosely) unified system in Britain and Ireland. However, the Government of Ireland Act, 1920 separated the bank after the partition of Ireland, and the three above banks are the main legacy of the sytem.