| Honorific-Prefix: | The Honourable |
| Michael Duffy | |
| Office1: | Attorney-General for Australia |
| Term Start1: | 4 April 1990 |
| Term End1: | 24 March 1993 |
| Primeminister1: | Bob Hawke Paul Keating |
| Predecessor1: | Lionel Bowen |
| Successor1: | Duncan Kerr |
| Office2: | Minister for Trade Negotiations |
| Term Start2: | 24 July 1987 |
| Term End2: | 4 April 1990 |
| Primeminister2: | Bob Hawke |
| Predecessor2: | John Dawkins |
| Successor2: | Dr Neal Blewett |
| Office3: | Minister for Communications |
| Term Start3: | 11 March 1983 |
| Term End3: | 24 July 1987 |
| Primeminister3: | Bob Hawke |
| Predecessor3: | Neil Brown |
| Successor3: | Gareth Evans |
| Constituency Mp4: | Holt |
| Parliament4: | Australian |
| Predecessor4: | William Yates |
| Successor4: | Gareth Evans |
| Term Start4: | 18 October 1980 |
| Term End4: | 21 January 1996 |
| Birth Name: | Michael John Duffy |
| Birth Date: | 1938 3, df=yes |
| Birth Place: | Mildura, Victoria, Australia |
| Nationality: | Australian |
| Party: | Australian Labor Party |
Michael John Duffy (born 2 March 1938) is an Australian former politician who served as an Australian Labor Party member of the Australian House of Representatives for the Division of Holt from 1980 to 1996. He was Minister for Communications from 1983 to 1987, Minister for Trade Negotiations from 1987 to 1990 and the Attorney-General from 1990 to 1993.
On 6 February 1990, in recognition of work on the Closer Economic Relations agreement between Australia and New Zealand Duffy was the first Australian and fifteenth appointee to The Order of New Zealand.[1] [2] In 1990 he was also awarded the New Zealand 1990 Commemoration Medal.[3]
He retired from politics prior to the 1996 election which was held on his 58th birthday.
Duffy is currently the chairman of the board of directors for Racing Victoria Limited.[4]