| Les Irwin | |
| Honorific-Suffix: | CBE |
| Constituency Mp: | Mitchell |
| Parliament: | Australian |
| Predecessor: | John Armitage |
| Successor: | Alfred Ashley-Brown |
| Term Start: | 30 November 1963 |
| Term End: | 2 December 1972 |
| Birth Date: | 1898 5, df=yes |
| Birth Place: | Newcastle, New South Wales |
| Nationality: | Australian |
| Party: | Liberal Party of Australia |
| Occupation: | Bank manager |
| Allegiance: |  Commonwealth of Australia |
| Serviceyears: | 1916–1930 |
| Branch: | Australian Army Australian Flying Corps |
| Rank: | Lieutenant |
| Unit: | 35th Battalion |
| Awards: | Commander of the Order of the British Empire |
Leslie Herbert Irwin, CBE (1 May 1898 – 28 January 1985) was an Australian politician. Born in Newcastle, New South Wales, he was educated at state schools and underwent military service 1916–30.[1] Upon the end of his service, he became a bank manager. In 1963, he was selected as the Liberal candidate for the seat of Mitchell in the Australian House of Representatives. He was the last person born in the nineteenth century, the last person born before Federation, and the last World War I veteran elected to the House. He held Mitchell until his defeat in 1972. Irwin died in 1985.[2]