| Full name: | Leslie George O'Callaghan |
| Born: | 6th April 1879, Lincoln, Canterbury, New Zealand |
| Died: | 12th October 1917, killed in action, Ypres, Belgium |
| Bowling: | Right-arm fast |
| Relations: | Brother: SR O'Callaghan; Brother: AP O'Callaghan |
| Teams: | South Canterbury (Hawke Cup: 1910/11-1911/12); All teams |
| Lists of matches and more detailed statistics | |