• Otero, Ana (1970) • Otley (England) • O’Toole, Peter (1932-2013) • Ottawa (Canada) • Otterlo (Netherlands) • Ottery St. Mary (England)
Os
• Oscar • O’Shea, Milo (1926-2013) • Oskar Reinhart Collection (Winterthur) • Oslo (Norway) • Osny (France) • Ospedale degli Innocenti (Firenze) • Ostend (Belgium) • Ostermundigen (Switzerland) • Österreichische Galerie Belvedere (Vienna) • Ostrava (Czech Republic) • Ostrich
Or
• Orange • Order of Australia • Order of Merit • Order of the Bath • Order of the British Empire • Order of the Companions of Honour • Ordination • Ordre des Arts et des Lettres • Orense (España) • Organ • Organist • Organists • Organization • Organizations • Oriental…
Op
• Ophelia • Oppian Hill (Rome) • Oppio (Roma)
On
• Oneglia (Italia) • O’Neil, Barbara (1910-1980) • O’Neil, Ryan (1941-2023) • O’Neill, Jennifer (1948) • Onion • Ontario (Canada)
Om
• Omaha, NE (USA) • Omphale • OMRI = Ordine al merito della Repubblica Italiana • OMWEA = Odessa Museum of Western and Eastern Art (Odessa)
Ol
• Olalla, Carlos (1957) • Old • Old Bethpage, NY (USA) • Old Saybrook, CT (USA) • Oldman, Gary (1958) • Olivier, Laurence (1907-1989) • Olomouc (Czech Republic) • Olympus