| Honorific-Prefix: | The Honourable |
| Nick McKenna | |
| Office: | Leader of the Opposition in the Senate |
| Term Start: | 11 June 1951 |
| Term End: | 17 August 1966 |
| Predecessor: | Bill Ashley |
| Successor: | Don Willesee |
| Office1: | Minister for Health |
| Primeminister1: | Ben Chifley |
| Term Start1: | 18 June 1946 |
| Term End1: | 19 December 1949 |
| Predecessor1: | James Fraser |
| Successor1: | Earle Page |
| Office2: | Minister for Social Services |
| Primeminister2: | Ben Chifley |
| Term Start2: | 18 June 1946 |
| Term End2: | 19 December 1949 |
| Predecessor2: | James Fraser |
| Successor2: | Bill Spooner |
| Title3: | Senator for Tasmania |
| Term Start3: | 1 July 1944 |
| Term End3: | 30 June 1968 |
| Predecessor3: | Richard Darcey |
| Successor3: | Ken Wriedt |
| Birth Date: | 1895 9, df=yes |
| Birth Place: | Carlton, Victoria, Australia |
| Death Place: | Crows Nest, New South Wales, Australia |
| Party: | Labor |
Nicholas Edward McKenna (9 September 1895 – 22 April 1974) was an Australian politician who served as a Senator for Tasmania from 1944 to 1968. He held ministerial office in the Chifley government from 1946 to 1949 as Minister for Health and Minister for Social Services. He was later Leader of the Opposition in the Senate for a record term of 15 years (1951–1966).
McKenna was born in the Melbourne suburb of Carlton and educated at St. Joseph's Christian Brothers' College, North Melbourne between 1904 and 1912.[1] In 1909 aged 13, McKenna and another boy were instrumental in saving the life of a man floundering in the water off the pier at Elwood. Their local newspaper describing the incident said that, "...they furnish a bright example to other youths."[2]
McKenna excelled in his schooling passing seven subjects in the Senior Public University Examination in 1911 and eventually gaining second place in the national Federal Public Service Examination in 1912.
At age 17 he joined the Commonwealth Public Service in the Auditor General's office. He earned an LL.B. from the University of Melbourne in 1923 and was admitted as a barrister and solicitor in 1928. He moved to Hobart in 1929 and married Kathleen Mary Coghlan in January 1930—they had a son and daughter.
McKenna was elected as a senator for Tasmania at the 1943 election, representing the Australian Labor Party. He was appointed as Minister for Health and Minister for Social Services in the second Chifley Ministry in November 1946 and held those positions until the defeat of the Chifley government at the 1949 election.[3] He campaigned energetically for the 1946 referendums and, with the passage of the social services proposal, he was in charge of the government's attempt to introduce a national health scheme.
McKenna was leader of the opposition in the Senate from 1951 to 1966. He took an active part in the fight against the banning of the Communist Party of Australia in the 1951 referendum. He considered that it was a high point in his career that Australia has "decided not to become a police state". He retired from the Senate in July 1968.
McKenna's wife and son both died in 1969. He survived them by five years, eventually passing away in 1974 at the Sydney suburb of Crows Nest, New South Wales, survived by his daughter. He was a Catholic.