| Jack Dufficy | |
| Constituency Am1: | Warrego |
| Assembly1: | Queensland Legislative |
| Term Start1: | 3 March 1951 |
| Term End1: | 17 May 1969 |
| Predecessor1: | Harry O'Shea |
| Successor1: | Jack Aiken |
| Birth Date: | 2 November 1901 |
| Birth Place: | Byrnestown, Queensland, Australia |
| Death Place: | Charleville, Queensland, Australia |
| Birthname: | John Joseph Dufficy |
| Nationality: | Australian |
| Party: | Labor |
| Spouse: | Gloria Williamsen (m.1956) |
| Occupation: | Trade union official |
John Joseph Dufficy (2 November 1901 - 6 November 1969) was an Australian politician. He was the Labor Party member for Warrego in the Legislative Assembly of Queensland from 1951 to 1969 when he died in Queensland Australia at age 68.[1]