Sir Richard Douglas Denman, 1st Baronet (24 August 1876 – 22 December 1957), was a radical British Liberal Party politician .
Denman was the son of Richard Denman, a court clerk and Helen Mary McMicking.Thomas Denman, 1st Baron Denman, Lord Chief Justice of the King's Bench, was his great-grandfather. Thomas Denman, 3rd Baron Denman, Governor-General of Australia, was his elder brother.
In December 1905 he was appointed as Private Secretary to Sydney Buxton the Postmaster General. Denman was elected to the House of Commons for Carlisle as a Liberal in January 1910. In February 1910, when Sydney Buxton was appointed President of the Board of Trade he appointed Denman as his Parliamentary Private Secretary. In 1911 he served as Chairmam of London Juvenile Advisory Committee.
In 1914 when war broke out he joined the Union of Democratic Control, a pressure group of Liberal and Labour politicians who were critical of the Government's war policies. In 1917 he was appointed Parliamentary Private Secretary to Sir Herbert Fisher the President of the Board of Education and to Rowland Prothero the President of the Board of Agriculture and Fisheries in the Coalition government of Lloyd George.