Mine workers with surname beginning O
| Surname | Forename/Initials | Notes |
|---|---|---|
| O'Brien | F J | |
| O'Brien | J | |
| O'Brien | J | |
| O'Bullivan | F | |
| Ocaccia | R J | |
| O'Connell | J | |
| O'Connor | M | |
| O'Gorman | P | |
| Oldaker | P A | |
| O'Malley | T | |
| O'Neill | C D | |
| O'Neill | G | |
| O'Neill-Cronin | M J | |
| Onions | J | |
| Oragoonis | G | |
| Oregan | J | |
| O'Reilly | C B | |
| O'Reilly | E | |
| O'Reilly | ||
| Ornig | W | |
| Osborne | A | |
| O'Sell | P T | |
| Ostojic | M | |
| O'Toole | P | |
| Oversby | N | |
| Owen | D A | |
| Owen | T | |
| Owen | W F | |
| Oxley | H |