| Sir Tom Macdonald | |
| Term Start: | March 1961 |
| Term End: | May 1968 |
| Term Start2: | 13 December 1949 |
| Term End2: | 26 September 1957 |
| Term Start3: | 26 November 1954 |
| Term End3: | 12 December 1957 |
| Term Start4: | 26 November 1954 |
| Term End4: | 12 December 1957 |
| Birth Name: | Thomas Lachlan Macdonald |
| Birth Date: | 14 December 1898 |
| Birth Place: | Invercargill, New Zealand |
| Death Place: | Wellington, New Zealand |
| Allegiance: | New Zealand |
| Serviceyears: | 1918–1919 1940–1943 |
| Battles: | First World War |
Sir Thomas Lachlan Macdonald (14 December 1898 – 11 April 1980) was a New Zealand politician of the National Party. He served as Minister of Defence (1949–1957), Minister of External Affairs (1954–1957), and Minister of Island Territories (1955–1957), and was New Zealand High Commissioner to the United Kingdom (1961–1968).
Macdonald was born in Invercargill on 14 December 1898, to parents Thomas Forsaith Macdonald, a farmer, and Margaret Ann Matheson. One of his great-grandfathers, Thomas Forsaith, was a member of the 1st New Zealand Parliament. Macdonald was educated at South School and Southland Boys' High School. He served in the New Zealand Expeditionary Force in Palestine in the First World War, and in the Second World War he served in Egypt, rising to the rank of captain until he was invalided home in 1943.[1]
Macdonald was the Member of Parliament for Mataura to 1946, then Wallace to 1957, when he retired. He was Minister of Defence (1949–1957), Minister of External Affairs (1954–1957), and Minister of Island Territories (1955–1957) in the First National Government.[2] From 1961 to 1968 he was the New Zealand High Commissioner to the United Kingdom.
In the 1963 New Year Honours, Macdonald was appointed a Knight Commander of the Order of St Michael and St George. He died in 1980.
Mount Macdonald in Antarctica was named for him by the New Zealand Geological Survey Antarctic Expedition (1961–62).[3]
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