Raja Sir Maharaj Singh CIE CStJ (17 May 1878, Kapurthala, Punjab – 6 June 1959, Lucknow) was the first Indian Governor of Bombay.

After conversion, Harnam Singh had married Priscilla, daughter of Golaknath Chatterjee, who was of Bengali Brahmin heritage and a convert to Christianity.

Among his siblings was Rajkumari Amrit Kaur, the prominent Congress politician who served as Minister of Health in the Nehru government after independence.

Maharaj Singh was educated at Harrow School and Balliol College, Oxford, where he completed his MA, and was called to Bar by the Middle Temple in 1902.

Additionally, he served for a brief period as the Prime Minister of Kashmir, playing a significant role during a pivotal time in the region's history.