Mary Costello | |
|---|---|
| Born | 6 January 1839 |
| Died | 18 December 1924 (aged 85) |
| Occupation | Pastoralist |
| Spouse | John Costello |
| Children | Michael, Mary Jane Gertrude, Kate, Ellen, Annie, John Patrick, Patrick |
| Parent(s) | Patrick Scanlan and wife |
Mary Costello (née Scanlan) (6 January 1839 – 18 December 1924) was a pioneering pastoralist in the Northern Territory of Australia.