Browse Archival Series - O
- Obstetric medical records (1952 - 1982), Mater Misericordiae Hospital
- Obstetric records (1943 - 1963), Royal North Shore Hospital
- Obstetrics journals: form for admission of waiting patients (1909 - 1914), Benevolent Society of New South Wales
- Orphanage records (incomplete) (c. 1911 - 1977), CatholicCare Hunter-Manning Social Services
- Our Children's Home, Records about residents, [dates unknown] (1918? - ?)
