Lawrence John Lumley Dundas, 2nd Marquess of Zetland,, styled Lord Dundas until 1892 and Earl of Ronaldshay between 1892 and 1929, was a British hereditary peer and Conservative politician. An expert on India, he served as Secretary of State for India in the late 1930s.

His Majesty's Principal Secretary of State for India, known for short as the India secretary or the Indian secretary, was the British Cabinet minister and the political head of the India Office responsible for the governance of the British Indian Empire, including Aden, Burma and the Persian Gulf Residency. The post was created in 1858 when the East India Company's rule in Bengal ended and India, except for the Princely States, was brought under the direct administration of the government in Whitehall in London, beginning the official colonial period under the British Empire.