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Peter James O'Mahony (born 17 September 1989) is an Irish former professional rugby union player who played as a flanker for Munster and for the Ireland national team. O'Mahony played as a flanker. During his career, O'Mahony has captained Presentation Brothers College, Ireland U18, Ireland U20, Munster, Ireland and the British & Irish Lions. He formerly represented Cork Constitution in the All-Ireland League.
| Against | Played | Won | Lost | Drawn | Tries | Points | % Won |
| Argentina | 5 | 5 | 0 | 0 | 0 | 0 | 100 |
| Australia | 8 | 6 | 2 | 0 | 0 | 0 | 75 |
| Canada | 3 | 3 | 0 | 0 | 0 | 0 | 100 |
| England | 16 | 7 | 9 | 0 | 0 | 0 | 43.75 |
| France | 12 | 8 | 2 | 2 | 0 | 0 | 66.67 |
| Georgia | 1 | 1 | 0 | 0 | 0 | 0 | 100 |
| Italy | 9 | 8 | 1 | 0 | 1 | 5 | 88.89 |
| Japan | 3 | 2 | 1 | 0 | 0 | 0 | 66.67 |
| New Zealand* | 13 | 4 | 9 | 0 | 0 | 0 | 30.77 |
| Romania | 1 | 1 | 0 | 0 | 2 | 10 | 100 |
| Russia | 1 | 1 | 0 | 0 | 1 | 5 | 100 |
| Samoa | 3 | 3 | 0 | 0 | 1 | 5 | 100 |
| Scotland | 14 | 13 | 1 | 0 | 0 | 0 | 92.86 |
| South Africa | 7 | 5 | 2 | 0 | 0 | 0 | 71.43 |
| Tonga | 1 | 1 | 0 | 0 | 0 | 0 | 100 |
| United States | 1 | 1 | 0 | 0 | 0 | 0 | 100 |
| Wales | 15 | 10 | 5 | 0 | 0 | 0 | 66.67 |
| Total | 113 | 79 | 32 | 2 | 5 | 25 | 69.91 |