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- Oak Park
- Oakden, Percy (1845 - 1917), architect and surveyor
- Oaklands Junction
- Oakleigh
- O'Brien, Jack Lockyer (John) (1909 - 1965), historian
- O'Brien, John William Alexander (1908 - 1980), engineer and soldier
- O'Bryan, Norman John (1894 - 1968), judge
- Observer
- see Macdonald, Donald Alaster (1859 - 1932)
- O'Callaghan, Thomas (1845 - 1931), policeman
- O'Donnell, David George (1860 - 1946), policeman
- O'Donnell, Nicholas Michael (1862 - 1920), Gaelic scholar and Irish nationalist
- O'Dowd, Bernard Patrick (1866 - 1953), parliamentary draughtsman, poet and radical
- O'Driscoll, Charles Xavier (1870 - 1963), educationist
- O'Driscoll, John Xavier (1903 - 1977), barrister, judge and sporting administrator
- O'Ferrall, Ernest Francis (1881 - 1925), journalist and writer
- Officer
- Officer, Edward Cairns (1871 - 1921), artist
- Officer, Frank Keith (1889 - 1969), diplomat
- Ogg's Pharmacy
- O'Grady, Thomas (1824 - 1890), contractor
- O'Hara, Henry Michael (1853 - 1921), surgeon
- Old Age
- Old Colonists Association
- Old Melbourne Cemetery
- Old Melbourne Gaol
- Old Tin Shed
- Old White Hart Hotel
- Old, Ernest (Ernie) (1874 - 1962), cyclist and soldier
- Oldham, Trevor Donald (1900 - 1953), barrister and politician
- Olinda
- Oliphant, Ernest Henry Clark (1862 - 1936), journalist, lecturer, playwright and Shakespearean scholar
- Oliver Lane
- Oliver Place
- Olivers Hill
- Olney, Herbert Horace (1875 - 1957), manufacturer, philanthropist and politician
- O'Loghlen, Bryan (1828 - 1905), politician
- Olsen, Diedre
- see Cash, Deirdre [Criena Rohan] (1924 - 1963), novelist
- Olympic Consolidated Industries
- Olympic Games
- Olympic Park
- Olympic Theatre
- Olympic Village
- O'Malley, King (1858 - 1953), insurance salesman and politician
- O'Neill, Patrick (1886 - 1968), Christian Brother and schoolteacher
- Opera
- Opera House
- Orange Lodge (Loyal Orange Institution)
- Orchards
- Orchestras
- Organised Crime
- Orica
- Ormond
- Ormond, Francis (1829 - 1889), grazier and philanthropist
- O'Rourke, Stella
- see Power, Stella (1896 - 1977), soprano
- Orphanages
- Orthodox Churches
- Osborne
- Osborne, Ethel Elizabeth (1882 - 1968), industrial hygienist and medical practitioner
- Osborne, Henry William (Harry) (1865 - 1936), co-operatives organizer and journalist
- Osborne, William Alexander (1873 - 1967), broadcaster, man of letters and professor of physiology
- O'Shanassy, John (1818 - 1883), businessman and politician
- Outer Circle Railway
- Overland
- Oz Child
- Ozanam House
