Sir Donald Maclean KBE (9 January 1864 – 15 June 1932) was a British Liberal Party politician in the United Kingdom.

He was Leader of the Opposition between 1918 and 1920 and served in the Cabinet of Ramsay MacDonald's National Government as President of the Board of Education from 1931 until his death in June the following year.

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.

[7] He then represented Peebles and South Midlothian between 1918 and 1922,[7] losing in the 1922 United Kingdom general election, and then the Northern Division of Cornwall between 1929 and 1932.

They are buried in the churchyard of Holy Trinity Church, Penn, Buckinghamshire, together with their eldest son, Ian.