William Thomas Brownlow Cecil, 5th Marquess of Exeter, KG, CMG, TD (27 October 1876 – 6 August 1956), known as Lord Burghley from 1895 to 1898, was a British peer.
Lord Exeter married Hon. Myra Orde-Powlett, daughter of William Orde-Powlett, 4th Baron Bolton, on 16 April 1901. They had four children:
Lady Letitia Sibell Winifred Brownlow-Cecil (b. 20 November 1903- d. 21 July 1992 Dalton Holme, Yorkshire, ENG), married Henry Hotham, 7th Baron Hotham and had issue.
Lady Romayne Elizabeth Algitha Brownlow-Cecil (22 March 1915– d. 27 June 2001 Stamford, Lincolnshire, ENG), married Major Hon. Peter Brassey, son of Henry Brassey, 1st Baron Brassey and had issue.