Oberschlesien / Upper Silesia (1)

Objektkunst / object art (35)

Objektkunst / object Art (5)

Obst / fruit (3)

Obstanbau / fruit-growing (1)

Obstbau / pomiculture (1)

Obstbaum / fruit tree (2)

Obstzucht / fruit farm (3)

Okkultismus / occultism (3)

Ökologie / ecology (1)

Ökonomie / economy (45)

Ölbild / oil paint (7)

Ontologie / ontology (2)

Op-Art / optische Kunst (7)

op-art, optical art / optische Kunst (9)

Oper / opera (9)

Operngeschichte / history of opera (8)

Optik / optics (8)

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 (2)

Orgelgeschichte (1)

Orient / orient (25)

Orientalismus / orientalism (6)

Orientalistik / orientalism (4)

Orientteppich / oriental carpet, eastern carpet (2)

Original Acrylstich / original acryl engraving (1)

Original Aquarell / original watercolour painting (14)

Original Ölbild / original oil painting (7)

Original-Aquarell / original watercolor (4)

Original-Fotografie / Original-Photographie / original photograph (73)

Original-Gemälde / original painting (2)

Original-Grafik / Original-Graphik / original graphic (765)

Original-Heliogravüre / original-heliogravure (1)

Original-Holzschnitt / original woodcut (318)

Original-Holzstich / original wood engraving (31)

Original-Kupferstich / original copper engraving (108)

Original-Linolschnitt / original linocut (59)

Original-Lithografie / Original-Lithographie / original lithograph (330)

Original-Offset / original offset (24)

Original-Plastik / original sculpture (11)

Original-Radierung / original etching (520)

Original-Siebdruck, Serigrafie / original screenprint, silkscreen, serigraphy (55)

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

Original-Stahlstich / original steel etching (1)

Original-Zeichnung / original drawing (79)

Original-Zinkografie / original zincograph (9)

Originalfotografie / Originalphotographie / original photograph (10)

Originalgrafik / Originalgraphik / original graphic (93)

Originalholzschnitt / original woodcut (2)

Originalkupferstich / original copper engraving (8)

Originallinolschnitt / original linocut (2)

Ornament, Ornamentik / fancywork / ornament (11)

Ornithologie, Vogelkunde / ornithology (9)

Ortskunde / Landeskunde / applied geography (123)

Osmanen / Ottomans (2)

Osmanisches Reich / Ottoman Empire (2)

Österreich / Austria (16)

österreichische Geschichte / austrian history (16)

österreichische Kunst / austrian art (22)

österreichische Literatur / austrian literature (47)

Osteuropa / eastern europe (8)

Ostpreußen / East Prussia (4)

Ostsee / Baltic sea (1)

Ozeanien / Oceania (2)