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City Union Bank Limited (CUB) was founded on October 31, 1904, in Kumbakonam, Tamil Nadu, under the original name of "The Kumbakonam Bank Limited." The institution was initially conceived as a regional bank, primarily serving the local community, agricultural sector, and small businesses in the Thanjavur district of Tamil Nadu. Throughout its early decades, the bank preferred a local role, adopting an agency model until its first branch was opened in 1930. It began expanding its presence outside of Tamil Nadu in the 1980s, and in 1987, the bank's name was officially changed to City Union Bank Limited to better reflect its growing national reach and image.

Today, City Union Bank Limited operates as an Indian private sector bank and is a public limited company, with its shares listed and traded on both the National Stock Exchange (NSE) and the Bombay Stock Exchange (BSE). Its significance in the Indian financial system stems from its long history as one of the country's oldest private sector banks and its continued focus on servicing the retail, small, and medium enterprises (SMEs), and agricultural sectors. Headquartered in Kumbakonam, CUB maintains a pan-India presence with a strong foothold in South India, particularly Tamil Nadu, and is recognized for its broad offering of traditional banking and modern technological services, including various digital banking solutions.