Sir Peter Drummond Macdonald KBE (1 February 1894 – 2 December 1961) was a Canadian-born Conservative Party politician in the United Kingdom.

He was aided from the shelling with assistance walking but a right arm injury and contused back saw him returned to Norfolk War Hospital, Thorpe, Norwich, England.

He remained with CAPC until 2 November 1917 when he received a Lieutenant's commission to the Army Service Corps, ASC, Camp Aldershot.

[1] At the 1923 general election he was chosen by the Conservatives to contest the Isle of Wight constituency as a Unionist candidate, and narrowly failed to unseat the sitting Liberal MP, J. E. B. Seely.

Seely held the seat with a majority of 90 votes in a three-way contest, with the Labour Party candidate coming a distant third.

[1] During the Second World War, MacDonald saw service in 242 Squadron as Flight Officer and as Adjutant to Douglas Bader during the Battle of Britain.

[1] MacDonald held a number of positions within the parliamentary Conservative Party including holding the chair of the Imperial Affairs Committee for more than 20 years.

The following year, In December 1933, Lady Jean Cochrane remarried at a London register office to Member of Parliament, Captain Peter Macdonald.

Upon Lady Jean's death in January 1955, MP, Captain Peter MacDonald began a relationship with Dr. Phoebe Harvey, Consultant Anaesthetist, of Shanklin.