|The Right Honourable
|Leader of the Opposition|
December 1918 – 12 February 1920
|Prime Minister||David Lloyd George|
|Preceded by||Herbert Henry Asquith|
|Succeeded by||Herbert Henry Asquith|
|President of the Board of Education|
25 August 1931 – 15 June 1932
|Prime Minister||Ramsay MacDonald|
|Preceded by||Hastings Lees-Smith|
|Succeeded by||The Lord Irwin|
|Born||Donald Charles Hugh Maclean
9 January 1864
Farnworth, Bolton, Lancashire
|Died||15 June 1932
|Spouse(s)||Gwendoline Katherina Leonora Hope|
Sir Donald Charles Hugh Maclean, KBE, PC (9 January 1864 – 15 June 1932), was a British Liberal politician. He was Leader of the Opposition between 1918 and 1920 and served in Ramsay MacDonald's National Government as President of the Board of Education between 1931 and his death in June of the following year.
Political career 
Maclean practised as a solicitor with practices in Cardiff and Lincoln's Inn Fields, London. A member of the Presbyterian Church of England, he was vice-president of the Cardiff Free Church Council in 1902-3, and also worked closely with the National Society for the Prevention of Cruelty to Children. He was a last-minute choice as one of the Liberal Party candidates in Bath at the 1900 general election, but was defeated at the polls. At the 1906 general election, he stood again and was elected as a Liberal Member of Parliament for the constituency.
He lost his seat at the January 1910 general election, but moved constituency at the December 1910 general election and was returned for Peebles and Selkirk, a seat he held until 1918, and then represented Peebles and South Midlothian between 1918 and 1922 and the Northern Division of Cornwall between 1929 and 1932.
Maclean was knighted and appointed a Privy Counsellor in 1916, and was Leader of the Liberal Parliamentary Party from 1918 to 1922, as the nominal leader of the Liberal Party, Herbert Henry Asquith had lost his seat in the House of Commons. For two years he also served as Leader of the Opposition, while Labour had no official leader and Sinn Féin refused to participate in parliamentary government.
Towards the end of his life, Maclean joined the National Government headed by Ramsay MacDonald. He served as President of the Board of Education from 1931 to 1932, when he died from cardiovascular disease at the age of sixty-eight.
Maclean married Gwendolen Margaret Devitt (26 September 1880 – 23 July 1962) daughter of Andrew Devitt (1850–1931) and wife Jane Dales Morrison (1856–1947), on 26 October 1907. They and their eldest son, Ian, are buried in the churchyard of Holy Trinity Church, Penn, Buckinghamshire. Another of his sons was the diplomat and spy, Donald Duart Maclean.
- History of the Liberal Party 1895–1970, by Roy Douglas (Sidgwick & Jackson 1971)
- Who's Who of British Members of Parliament, Volume III 1919–1945, edited by M. Stenton and S. Lees (Harvester Press 1979)
- "The Popular Guide to the House of Commons" (Pall Mall Gazette "Extra"), February 1906, p. 48.
- leighrayment.com House of Commons: Baillieston to Beckenham
- "The Popular Guide to the House of Commons" (Pall Mall Gazette "Extra"), January 1911, p. 136.
- leighrayment.com House of Commons: Paddington to Platting
- leighrayment.com House of Commons: Cornwall to Cynon Valley
- The London Gazette: . 28 January 1916.
- Douglas in The History of the Liberal Party 1895–1970 observes that "The technical question whether the Leader of the Opposition was Maclean or William Adamson, Chairman of the Parliamentary Labour Party, was never fully resolved ... The fact that Adamson did not press his claim for Opposition leadership is of more than technical interest, for it shows that the Labour Party was still not taking itself seriously as a likely alternative government"
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