Joseph Duffy is an Irish retired mixed martial artist who competed in the lightweight division of the Ultimate Fighting Championship. A professional since 2008, he has formerly competed for Cage Warriors and was a contestant on The Ultimate Fighter: Team GSP vs. Team Koscheck. He is also a former professional boxer.

| Title | ||||||
|---|---|---|---|---|---|---|
UFC Fight Night 172: Figueiredo vs. Benavidez 2 | Self | 0 | 2020-07-19 | 0.5803 | ||
Cage Warriors 39: The Uprising | Self | 0 | 2010-11-27 | 0.3415 | ||
UFC 195: Lawler vs. Condit | Self | 9 | 2016-01-02 | 0.6052 | ||
UFC Fight Night 90: Dos Anjos vs. Alvarez | Self | 8 | 2016-07-07 | 0.7394 | ||
UFC Fight Night 72: Bisping vs. Leites | Self | 0 | 2015-07-18 | 0.4516 | ||
UFC 185: Pettis vs. Dos Anjos | Self | 0 | 2015-03-14 | 0.486 | ||
UFC Fight Night 147: Till vs. Masvidal | Self | 0 | 2019-03-16 | 1.727 | ||
UFC Fight Night 107: Manuwa vs. Anderson | Self | 6 | 2017-03-18 | 0.5639 | ||
UFC 217: Bisping vs. St-Pierre | Self | 6.1 | 2017-11-04 | 0.6606 |