Oberschlesien / Upper Silesia (1)

Objektkunst / object art (34)

Objektkunst / object Art (7)

Obst / fruit (2)

Obstanbau / fruit-growing (1)

Obstbau / pomiculture (1)

Obstbaum / fruit tree (2)

Obstzucht / fruit farm (3)

Okkultismus / occultism (3)

Ökologie / ecology (1)

Ökonomie / economy (53)

Ölbild / oil paint (8)

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 (3)

Orden / order, religious order (41)

Ordenstracht / habit of a religious order (39)

Organische Chemie / organic chemistry (1)

Orgel / pipe organ (1)

Orient / orient (30)

Orientalismus / orientalism (6)

Orientalistik / orientalism (7)

Orientteppich / oriental carpet, eastern carpet (2)

Original Acrylstich / original acryl engraving (1)

Original Aquarell / original watercolour painting (17)

Original Ölbild / original oil painting (8)

Original-Aquarell / original watercolor (2)

Original-Fotografie / Original-Photographie / original photograph (74)

Original-Gemälde / original painting (1)

Original-Grafik / Original-Graphik / original graphic (747)

Original-Heliogravüre / original-heliogravure (1)

Original-Holzschnitt / original woodcut (298)

Original-Holzstich / original wood engraving (28)

Original-Kupferstich / original copper engraving (95)

Original-Linolschnitt / original linocut (64)

Original-Lithografie / Original-Lithographie / original lithograph (353)

Original-Offset / original offset (28)

Original-Plastik / original sculpture (12)

Original-Radierung / original etching (528)

Original-Siebdruck, Serigrafie / original screenprint, silkscreen, serigraphy (61)

Original-Siebdruck, Serigrafie / original screenprint, silksreen, serigraphy (86)

Original-Stahlstich / original steel etching (1)

Original-Zeichnung / original drawing (80)

Original-Zinkografie / original zincograph (3)

Originalfotografie / Originalphotographie / original photograph (13)

Originalgrafik / Originalgraphik / original graphic (107)

Originalholzschnitt / original woodcut (2)

Originalkupferstich / original copper engraving (8)

Originallinolschnitt / original linocut (3)

Ornament, Ornamentik / fancywork / ornament (11)

Ornithologie, Vogelkunde / ornithology (8)

Ortskunde / Landeskunde / applied geography (137)

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 (32)

Osteuropa / eastern europe (10)

Ostpreußen / East Prussia (5)

Ostsee / Baltic sea (2)

Ozeanien / Oceania (3)