Diamond Queen is a 1940 Hindi action adventure comedy film. It was directed by Homi Wadia and produced by Wadia Movietone. It starred Fearless Nadia, John Cawas, Radha Rani, Sayani Atish, Sardar Mansur, Dalpat, Kunjru, and Boman Shroff. This film was the seventh in the Diamond thriller series with the first being Veer Bharat in 1934, directed by Homi Wadia under the production of J. B. H. Wadia. It is cited as one of the best films produced by the Wadia brothers. The film's success saw Homi Wadia becoming a producer by which he was able to obtain raw stock for his films due to the rationing of two films per producer during the Second World War.