Oberschlesien / Upper Silesia (1)

Objektkunst / object art (36)

Objektkunst / object Art (8)

Obst / fruit (3)

Obstanbau / fruit-growing (2)

Obstbau / pomiculture (1)

Obstbaum / fruit tree (2)

Obstzucht / fruit farm (4)

Okkultismus / occultism (3)

Ökologie / ecology (1)

Ökonomie / economy (52)

Ölbild / oil paint (9)

Olympiade / Olympiad (1)

Olympische Spiele / Olympic Games (1)

Ontologie / ontology (3)

Op-Art / optische Kunst (3)

op-art, optical art / optische Kunst (7)

Oper / opera (8)

Operette / operetta (1)

Operngeschichte / history of opera (7)

Optik / optics (10)

Orchester / orchestra (2)

Orchideen / orchids (1)

Orden / Medal / decoration (4)

Orden / order, religious order (41)

Ordenstracht / habit of a religious order (39)

Organische Chemie / organic chemistry (1)

Orient / orient (31)

Orientalismus / orientalism (7)

Orientalistik / orientalism (8)

Orientteppich / oriental carpet, eastern carpet (2)

Original Acrylstich / original acryl engraving (1)

Original Aquarell / original watercolour painting (10)

Original Ölbild / original oil painting (9)

Original-Aquarell / original watercolor (1)

Original-Fotografie / Original-Photographie / original photograph (75)

Original-Grafik / Original-Graphik / original graphic (593)

Original-Heliografie / original-heliographic print (1)

Original-Heliogravüre / original-heliogravure (1)

Original-Holzschnitt / original woodcut (275)

Original-Holzstich / original wood engraving (26)

Original-Kupferstich / original copper engraving (99)

Original-Linolschnitt / original linocut (68)

Original-Lithografie / Original-Lithographie / original lithograph (286)

Original-Offset / original offset (25)

Original-Plastik / original sculpture (21)

Original-Radierung / original etching (458)

Original-Siebdruck, Serigrafie / original screenprint, silkscreen, serigraphy (57)

Original-Siebdruck, Serigrafie / original screenprint, silksreen, serigraphy (78)

Original-Stahlstich / original steel etching (1)

Original-Zeichnung / original drawing (82)

Original-Zinkografie / original zincograph (2)

Originalfotografie / Originalphotographie / original photograph (12)

Originalgrafik / Originalgraphik / original graphic (109)

Originalholzschnitt / original woodcut (2)

Originalkupferstich / original copper engraving (8)

Originallinolschnitt / original linocut (3)

Ornament, Ornamentik / fancywork / ornament (10)

Ornithologie, Vogelkunde / ornithology (9)

Ortskunde / Landeskunde / applied geography (141)

Osmanen / Ottomans (2)

Osmanisches Reich / Ottoman Empire (2)

Österreich / Austria (15)

österreichische Geschichte / austrian history (17)

österreichische Kunst / austrian art (15)

österreichische Literatur / austrian literature (23)

Osteuropa / eastern europe (10)

Ostpreußen / East Prussia (4)

Ostsee / Baltic sea (2)

Ozeanien / Oceania (3)