Sardar Dyal Singh Majithia (1848–1898) was an Indian banker and activist in progressive and social reform measures in Punjab.

He founded the English-language newspaper The Tribune and managed the affairs of the Harmandir Sahib ("Golden Temple") for nearly thirty years.

The Bank was founded on 23 May 1894 (its first meeting was held at 6:30 PM at Dyal Singh's house).

At the second meeting on 27 May 1894, Dyal Singh was appointed Chairman and Lala Harkishen Lal, the Secretary of the Board.

He was also a pillar of the Brahmo Samaj and donated liberally to educational institutions and libraries, including numerous colleges all over Northern India, like Dayal Singh College, Lahore and Dyal Singh Memorial Library, Lahore.