Union Bank of India (UBI) is an Indian public sector bank headquartered in Mumbai. It was established in 1919 and nationalised by the Government of India in 1969.

After the merger with Corporation Bank and Andhra Bank, which came into effect on 1 April 2020, UBI became one of the largest public sector banks with around 9,300 branches. Two of these are located overseas in Dubai and Sydney. UBI operates in the United Kingdom through its wholly owned subsidiary, Union Bank of India (UK). The bank also has over 10,000 ATMs and 23,000 Business Correspondent Points, with more than 76,700 employees.