Frank Louis Dumbell Elliott CB (11 September 1874 – 26 March 1939) was an Assistant Commissioner of the London Metropolitan Police from 1914 to 1931. Elliott was born in Nynee Tal, British India, the son of Sir Charles Elliott, former Lieutenant-Governor of Bengal, and Louisa Jane Dumbell of Onchan, Isle of Man, daughter of George Dumbell. He was educated at Harrow School from 1888 and won a scholarship to Trinity College, Cambridge in 1892, obtaining a first class degree in Classics in 1896. In 1898, he joined the Home Office. In 1899, he married Mabel Murray; they had a daughter and a son (who became a solicitor).