Henry John Reynolds-Moreton, 3rd Earl of Ducie GCVO PC JP FRS (25 June 1827 – 28 October 1921), styled Lord Moreton between 1840 and 1853, was a British courtier and Liberal Party politician. He notably served as Captain of the Yeomen of the Guard from 1859 to 1866, and Lord Warden of the Stannaries from 1888 to 1908.
In 1852, Moreton entered Parliament as Member of Parliament (MP) for Stroud. The following year he succeeded his father in the earldom and entered the House of Lords. In 1859 he was admitted to the Privy Council and appointed Captain of the Yeomen of the Guard under Lord Palmerston, a post he held until the government fell in 1866, the last year under the premiership of Lord Russell.
Apart from his political career, Lord Ducie was Lord Lieutenant of Gloucestershire between 1857 and 1911 and Lord Warden of the Stannaries in Cornwall and member of the Council of the Prince of Wales between 1888 and 1908. In 1906 he was made a Knight Grand Cross of the Royal Victorian Order.
The earl was appointed Honorary Colonel of the 1st Administrative Battalion, Gloucestershire Rifle Volunteer Corps on 16 June 1868 and held the position for 40 years. The battalion later became the 2nd Volunteer Battalion, Gloucestershire Regiment.