Evelyn Cecil, 1st Baron Rockley, GBE, PC (1865 – 1 April 1941) was a British, Conservative Party politician.
Born in the parish of St George's, Hanover Square in the heart of London's Mayfair, Cecil was the eldest son of Lord Eustace Cecil, grandson of James Gascoyne-Cecil, 2nd Marquess of Salisbury, and cousin of both Sir Robert Cecil and Arthur Balfour. He was educated at Eton and New College, Oxford. Cecil was Private Secretary from 1891-2, to the Prime Minister, his uncle, Robert Gascoyne-Cecil, 3rd Marquess of Salisbury, during the latter's second term and during his third term from 1895-1902. On 16 February 1898, Cecil had married Hon. Alicia Amherst (a garden historian and daughter of William Tyssen-Amherst, 1st Baron Amherst of Hackney) and they had three children: Robert William Evelyn, later 2nd Baron Rockley (1901–1976), Margaret Gertrude (d. 1962) and Maud Katharine Alicia (d. 1981).
Cecil served as a Member of Parliament from 1898–1929 and was appointed a GBE in 1922. He and raised to the Peerage in 1934 as Baron Rockley, of Lytchett Heath, in the County of Dorset.
He died in 1941 in Poole aged 75.