| Name | Date Of Birth | Seasons | Debut Game | Height (cm) | Weight (kg) | Games | Goals |
|---|---|---|---|---|---|---|---|
| O'BREE, Dick | 05/06/1936 | 1956-1957 | Round 1, 1956 | 188 | 90 | 4 | 5 |
| O'BREE, Shane | 15/03/1979 | 2000-2010 | Round 1, 2000 | 182 | 81 | 227 | 84 |
| O'BRIEN, Bill | 23/03/1877 | 1897-1901 | Round 1, 1897 | 175 | 78 | 67 | 0 |
| O'BRIEN, Cameron | 28/09/1966 | 1985 | Round 22, 1985 | 190 | 96 | 1 | 0 |
| O'BRIEN, Denis | 10/04/1952 | 1971 | Round 6, 1971 | 178 | 72 | 1 | 0 |
| O'BRIEN, J | 01/01/0001 | 1895 | Round 1, 1895 | 14 | 7 | ||
| O'BRIEN, Joe | 01/01/0001 | 1892 | Round 14, 1892 | 4 | 2 | ||
| O'CALLAGHAN, Denis | 07/02/1949 | 1968-1973, 1975 | Round 3, 1968 | 178 | 80 | 129 | 3 |
| O'CONNOR, Jack | 08/11/1900 | 1918 | Round 2, 1918 | 179 | 74 | 3 | 1 |
| O'DONOGHUE, Dave | 11/07/1885 | 1907-1911 | Round 6, 1907 | 179 | 81 | 54 | 0 |
| O'DWYER, Ron | 05/02/1938 | 1959-1961 | Round 5, 1959 | 170 | 70 | 27 | 15 |
| O'LOUGHLIN, Thomas | 08/05/1869 | 1892 | Round 1, 1892 | 9 | 0 | ||
| O'SULLIVAN, Danny | 16/08/1952 | 1973 | Round 9, 1973 | 173 | 68 | 7 | 0 |
| OBORNE, Brad | 19/06/1980 | 1999-2000 | Round 6, 1999 | 176 | 80 | 5 | 4 |
| OBORNE, Rod | 06/09/1953 | 1972-1976, 1978-1979 | Round 1, 1972 | 183 | 76 | 87 | 85 |
| OGDEN, Percy | 24/02/1886 | 1905 | Round 15, 1905 | 170 | 70 | 4 | 0 |
| OHLSEN, Russell | 01/12/1955 | 1979-1981 | Round 3, 1979 | 183 | 80 | 50 | 22 |
| OLARENSHAW, Ricky | 01/02/1973 | 1999 | Round 1, 1999 | 182 | 80 | 5 | 0 |
| OLIVER, Norm | 15/08/1922 | 1940-1941 | Round 18, 1940 | 182 | 79 | 13 | 2 |
| OLIVER, Norm | 14/11/1885 | 1909-1911 | Round 7, 1909 | 175 | 72 | 33 | 2 |
| ORAM, Les | 18/03/1893 | 1916 | Round 3, 1916 | 178 | 71 | 7 | 4 |
| ORCHARD, Mark | 02/04/1976 | 1995-1996, 1999-2000 | Round 3, 1995 | 175 | 75 | 45 | 10 |
| ORFORD, Harry | 07/10/1875 | 1893 | Round 12, 1893 | 1 | 0 | ||
| ORVAL, Mark | 19/03/1968 | 1987-1988 | Round 16, 1987 | 188 | 83 | 7 | 7 |
| OSBORNE, Richard | 16/06/1964 | 1997-1998 | Round 1, 1997 | 182 | 86 | 29 | 26 |
| OSMOND, Keith | 26/01/1899 | 1926 | Round 5, 1926 | 165 | 67 | 4 | 0 |
| OUTRAM, Roy | 19/02/1901 | 1920 | Round 18, 1920 | 178 | 76 | 1 | 0 |
| OUTTRAM, Bruce | 07/09/1949 | 1970 | Round 15, 1970 | 182 | 80 | 1 | 0 |
| OXLEY, Adam | 01/11/1992 | 2013-2018 | Round 11, 2013 | 192 | 78 | 34 | 10 |