- Oddfellows Lodge (Weldborough, Tasmania)
- Oh Hoy family
- see O'Hoy family - Ohnm Lee
- see Ohum Lee - O'Hoy family
- O'Hoy, Alice
- see Tong, Alice (Bou Youk) (1900 - ) - O'Hoy, Eddie
- O'Hoy, Fee Lan (1890 - 1968)
- O'Hoy, Jan (1913 - 1980), restauranteur and storekeeper
- O'Hoy, Marie
- see Kuramoto, Marie - O'Hoy, Marjorie
- O'Hoy, Que (1875 - 1964), importer and exporter and storekeeper
- Ohum Lee
- Ohum Oye
- see Ohum Lee - O'Malley, Dorothy
- Omeo (Victoria)
- On Gay & Co
- see On Gay Jang store ( - 1920s) - On Gay Jane store
- see On Gay Jang store ( - 1920s) - On Gay Jang store ( - 1920s)
- On Hie
- On Hing Store
- On Lee (gardener), gardener
- On Lee, George
- Ong Lee, George
- see On Lee, George - Oodnadatta (South Australia)
- opium and tobacco smoking
- O'Yeung family
- O'Yeung, Gladys
- see O'Young, Gladys - O'Young family
- see O'Yeung family - O'Young, Gladys
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