Reginald Alexander Duff (17 August 1878 – 13 December 1911) was an Australian cricketer who played in 22 Tests between 1902 and 1905.
| Format | Matches | Runs | Avg | 100s/50s | Top Score | Wickets | Bowl Avg | Best Bowling | Catches/St |
| Tests | 22 | 1317 | 35.59 | 2/6 | 146 | 4 | 21.25 | 2/43 | 14/0 |
| First-class | 121 | 6589 | 35.04 | 10/33 | 271 | 14 | 34.14 | 2/17 | 73/0 |
