UBI operates in the United Kingdom through its wholly owned subsidiary, Union Bank of India (UK).

The bank has a network of 9300+ domestic branches, 10000+ ATMs, and 18000+ Business Correspondent Points serving over 153 million customers with 76,700+ employees.

[8] Union Bank of India was established on 11 November 1919 in Bombay (now Mumbai) by Seth Sitaram Poddar.

At the time of India's independence in 1947, the bank had four branches – three in Mumbai and one in Saurashtra in trade centres.

UBI expanded internationally in 2007 with the opening of offices in Abu Dhabi, United Arab Emirates and in Shanghai, China.