| O'HARA, FRANK (USA 1926-1966) | Hotel Particulier 1967 | OHaF1967hote |
| O'NEILL, LILLIAN (Ireland) | Richard Lovell Edgeworth (1744-1817) ca. 1950 | ONeL1950edge |
| OHLOW, EVA (Germany b. 1940) | Ohne Titel #1 (Untitled #1) 1996 | OhlE1996unt1 |
| " | Ohne Titel #2 (Untitled #2) 1996 | OhlE1996unt2 |
| " | Ohne Titel #3 (Untitled #3) 1996 | OhlE1996unt3 |
| " | Architecture #01: Tower of Babylon 2000 | OhlE2000ar01 |
| " | Architecture #02: Axis Mundi 2000 | OhlE2000ar02 |
| " | Architecture #03: Pyramid of Cyrus 2000 | OhlE2000ar03 |
| " | Architecture #04: Temple of Zeus 2008 | OhlE2000ar04 |
| " | Architecture #05: Ornamental Rendering of Eternity 2000 | OhlE2000ar05 |
| " | Architecture #06: Paraboloid in Nature 2000 | OhlE2000ar06 |
| " | Mathematics #01: Meridian 2000 | OhlE2000ma01 |
| " | Mathematics #02: Antipode & Antötre 2000 | OhlE2000ma02 |
| " | Mathematics #03: Astrolabe 2001 | OhlE2001ma03 |
| " | Mathematics #04: Parallel Projection 2001 | OhlE2001ma04 |
| " | Mathematics #05: Translation & Rotation 2001 | OhlE2001ma05 |
| " | Mathematics #06: Resemblance 2001 | OhlE2001ma06 |
| " | Mathematics #07: Total Differential 2001 | OhlE2001ma07 |
| " | Mathematics #08: Tetrahedron 2001 | OhlE2001ma08 |
| " | Mathematics #09: Genesis 2001 | OhlE2001ma09 |
| " | Mathematics #10: Spherical Trigonometry 2001 | OhlE2001ma10 |
| " | Mathematics #11: Tetraktys 2001 | OhlE2001ma11 |
| " | Mathematics #12: Intergral Method 2001 | OhlE2001ma12 |
| " | Mathematics #13: The Cavalieri Principle 2001 | OhlE2001ma13 |
| " | Mathematics #14: Section 2003 | OhlE2003ma14 |
| " | Mathematics #15: Section of the Sperical Triangle 2008 | OhlE2008ma15 |
| " | Mathematics #16: Three Pairs of Lines 2008 | OhlE2008ma16 |
| " | Mathematics #17: Cube 2008 | OhlE2008ma17 |
| " | Mathematics #18: Octahedron 2008 | OhlE2008ma18 |
| " | Mathematics #19: Dodecahedron 2008 | OhlE2008ma19 |
| " | Mathematics #20: Icosahedron 2008 | OhlE2008ma20 |
| " | Homage to Alexandria 2008 | OhlE2008alex |
| OLIVER, BOBBIE (Canada b. 1943) | Untiled 1976 | OliB1976unti |
| " | Untiled 1977 | OliB1977unti |
| OPPENHEIMER, JOEL (USA 1930-1988) | When the Drums Stopped 1967 | OppJ1967when |
| ORE, REBECCA (USA b.1948) | The Barbarian Queen 1990 | OreR1990barb |
| ORFANOS, ELLIE (Greece b. 1922) | Dr. Kathryn McElroy (1944-1947) 1947 | OrfE1947mcel |