| Penalties | Players | VS Club | Date | |
|---|---|---|---|---|
| 5 | Isikeli Nacewa | Exeter Chiefs | 16-12-2017 | Match details |
| 3 | Jonathan Sexton | Saracens | 01-04-2018 | Match details |
| 3 | Jonathan Sexton | Racing CF | 12-05-2018 | Match details |
| 2 | Jonathan Sexton | Glasgow Warriors | 21-10-2017 | Match details |
| 2 | Ross Byrne | Montpellier | 20-01-2018 | Match details |
| 2 | Isikeli Nacewa | Racing CF | 12-05-2018 | Match details |
| 1 | Jonathan Sexton | Exeter Chiefs | 10-12-2017 | Match details |
| 1 | Isikeli Nacewa | Exeter Chiefs | 10-12-2017 | Match details |
| 1 | Jonathan Sexton | Glasgow Warriors | 14-01-2018 | Match details |
| 1 | Jonathan Sexton | Scarlets | 21-04-2018 | Match details |
