| RADCLYFFE, WILLIAM (England 1783-1855) | University College from the Highstreet ca. 1830 | RadW1830univ |
| RAFANIDIS, ANTONIS (Greece) | Portrait of Greek Baby ca. 1900 Volos | RafA1900baby |
| RAFANIDIS & ZIMERIS (Greece) | Double Portrait of Greek Couple ca. 1930 Volos | RaZi1930coup |
| RAFFAËLLI, JEAN-FRANÇOIS (France 1850-1924) | Ragpicker ca. 1880 | RaJF1880ragp |
| RAMSDEN, JOHN WILLIAM, Sir (England 1831-1914) | Bust Portrait of English Lady ca. 1900 Leeds | RaJW1900lady |
| RANGOU, RANIA (Greece b. 1970) | ASTRNBE KKLO NIPNMOO 1997 | RanR1997astr |
| " | Congratulations Mary 2000 | RanR2000mary |
| RAU, MARCEL (Belgium 1886-1966) | F.I.D.E.M. Co-Founder Fernand Fisch (1897-1963) 1987 | RauM1987fisc |
| RAU, WILLIAM H. (USA 1855-1920) | Aspect of Old Bethlehem ca. 1900 Palestine | RaWH1900beth |
| " | Cathedral and Piazza del Duomo in Milan ca. 1900 Italy | RaWH1900mila |
| " | The Rio di San Barnaba in Venice ca. 1900 Italy | RaWH1900veni |
| " | Library of the Vatican in Rome ca. 1900 Italy | RaWH1900rome |
| " | City Hall of New York ca. 1900 USA | RaWH1900newy |
| " | Saint Paul's and Fleet Street in London ca. 1900 England | RaWH1900lond |
| REED, JOSEPH (USA b. 1932) | The Arts in America Alphabet 1993 | ReeJ1993alph |
| REGETZKY, FERENCZ (Serbia) | Double Portrait of Greek Couple 1895 Belgrade | RegF1895coup |
| REGOS, POLYKLEITOS (Greece 1903-1984) | Portrait of Georgia 1944 | RegP1944geor |
| REISER, ANDREAS D. (Germany) | Double Portrait of Baby and Girl ca. 1885 Alexandria | ReiA1885doub |
| " | Bust Portrait of Swiss Girl ca. 1890 Alexandria | ReiA1890girl |
| " | Bust Portrait George Trapantzalis ca. 1895 Alexandria | ReiA1895trap |
| " | Bust Portrait Mme Ch. Ott ca. 1900 Alexandria | ReiA1900ottc |
| " | Bust Portrait of Alice ca. 1900 Alexandria | ReiA1900alic |
| REMOUNDI, MAYA-MARIA (Greece 1960-2001) | Peintures (Paintings) 1984 | ReMM1984pein |
| " | My World 1992 | ReMM1992worl |
| RENTZIS, THANASSIS (Greece b. 1947) | Gyne (Woman) 2002 | RenT2002gyne |
| " | Untitled #1 2002 | RenT2002unt1 |
| " | Untitled #2 2002 | RenT2002unt2 |
| " | Untitled #3 2002 | RenT2002unt3 |
| " | Gray Field 2002 | RenT2002gray |
| " | Apotypomata: Profile 2008 | RenT2008apo1 |
| " | Apotypomata: Front 2008 | RenT2008apo2 |
| " | Apotypomata: Masculin 2008 | RenT2008apo3 |
| " | Apotypomata: Féminin 2008 | RenT2008apo4 |
| " | Apotypomata: Dialectic 2008 | RenT2008apo5 |
| " | Apotypomata: Dispersed 2008 | RenT2008apo6 |
| RETZEPOPOULOS, BABIS (Greece 1940-2002) | Composition Y 1972 | RetB1972comp |
| RHOMAÏDÈS, ARISTOTE (Greece d. 1916) | #1 Hélene Levides, at One 1897 Athens | RhoA1897hel1 |
| " | #2 Hélene Levides, at One 1897 Athens | RhoA1897hel2 |
| RHOMAÏDÈS FRÈRES (Greece d. 1896 & 1916) | Portrait of Greek Married Couple ca. 1880 Athens | RhoF1880coup |
| " | Calliope Trapantzali ca. 1885 Athens | RhoF1885trap |
| " | Georges Théologo, Five Months Old ca. 1890 | RhoF1890geor |
| " | Municipal Theater ca. 1890 Athens | RhoF1890thea |
| RICH, FRANCES (USA 1910-2007) | Scale Study for Army & Navy Nurse 1937 | RicF1937nur1 |
| " | Study for Army & Navy Nurse Bust 1938 | RicF1938nur1 |
| " | Army & Navy Nurse Bust 1938 | RicF1938nur2 |
| " | Saint Francis of Assisi with Birds ca. 1940 | RicF1940fran |
| " | Mary Magdalene at the Foot of the Cross 1941 | RicF1941mary |
| " | Bust Portrait #1 of Diego Rivera 1941 | RicF1941riv1 |
| " | Bust Portrait #2 of Diego Rivera 1941 | RicF1941riv2 |
| " | Bust Portrait of Herbert Davis 1948 | RicF1948davi |
| " | Scale Study #1 for Saint Francis of Assisi 1953 | RicF1953fra1 |
| " | Scale Study #2 for Saint Francis of Assisi 1953 | RicF1953fra2 |
| " | The Geyman Saint Francis of Assisi #1 1955 | RicF1955fra1 |
| " | The Geyman Saint Francis of Assisi #2 1955 | RicF1955fra2 |
| " | Mask of Diego Rivera ca. 1957 | RicF1957rive |
| " | Reclining Semi-Draped Nude 1959 | RicF1959nude |
| " | Tragic Mask of Katharine Hepburn 1960 | RicF1960trag |
| " | Katharine Hepburn as Cleopatra 1960/1961 | RicF1960cleo |
| " | Mask of Katharine Hepburn 1960/1965 | RicF1960kate |
| " | Saint Francis Beholding the Wonder of Nature ca. 1960 | RicF1960fran |
| " | Sketch for Portrait of Virgil Thomson 1960 | RicF1960thom |
| " | Mount Hymettus Saint Francis of Assisi 1969-1970 | RicF1970fran |
| " | Saint Francis of Assisi's Bird 1970 | RicF1970bird |
| " | Poster for Mount Hymettus Saint Francis of Assisi 1972 | RicF1972post |
| " | Bust Portrait of Frederick W. Sleight 1974 | RicF1974slei |
| " | Bas-Relief Tondo of Katharine Hepburn 1976 | RicF1976kate |
| RIGBY (USA) | Model: Pan American - Flying Cloud 1958 | Rigb1958PanA |
| RIKAKI, LUCIA (Greece 1961-2011) | Ellie Griva: Yes. The Bound Home 2009 | RikL2009home |
| RISTIC, KRISTINA (Serbia b. 1973) | Untitled 2003 | RisK2003unti |
| RITSOS, YANNIS (Greece 1939-1994) | Untitled: Brotherhood ca. 1975 | RitY1975brot |
| " | Manifestation of Emptiness 1979 | RitY1979mani |
| RIVELLIS, PLATON (Greece b. 1945) | Untitled 1997 Venice | RivP1997unti |
| RIVERA, DIEGO (Mexico 1886-1957) | Seated Portrait #1 of Frances Rich in her Studio 1941 | RivD1941ric1 |
| " | Seated Portrait #2 of Frances Rich in her Studio 1941 | RivD1941ric2 |
| ROBINSON, MARRIN (USA b. 1960) | Garden on Corfu 2003 | RobM2003corf |
| " | Meteora I - Morning Awakening 2005 | RobM2005morn |
| " | Meteora II - Bridge 2005 | RobM2005brid |
| " | Meteora III - The Song's Echo 2005 | RobM2005echo |
| " | Meteora IV - Evening's Last Lights 2005 | RobM2005last |
| " | ACG I - Chapel 2005 | RobM2005chap |
| " | ACG II - Saint Francis 2005 | RobM2005fran |
| " | ACG III - Art Center Atrium 2005 | RobM2005atri |
| " | ACG IV - View to the Stadium 2005 | RobM2005stad |
| ROKOS, KYRIAKOS (Greece b. 1945) | Free Open Universities 1983 | RokK1983univ |
| ROKOS, STEFANOS (Greece b. 1977) | Spiral & Space 2002 | RokS2002spir |
| ROOKER, EDWARD (England ca. 1712-1774) | The Gate of Athena Archegetis, Athens ca. 1770 | RooE1770arch |
| ROSA, U. (act: France) | French Sailor ca. 1910 Quai Cronstadt | RosU1910sail |
| ROSEN, JOSEPH R. (USA b.?) | Preamble to the Declaration of Independence ca. 1930 | RoJR1930inde |
| " | Abraham Lincoln's Second Inaugural Address ca. 1930 | RoJR1930linc |
| ROSENQUIST, JAMES (USA b. 1933) | Horizon 1970 | RosJ1970hori |
| " | Homage to President of NYU 1981 | RosJ1981brad |
| ROTHMANN, CHRISTIAN (Poland b. 1954) | Ohne Titel (Untitled) 2000 | RotC2000ohne |
| ROUMELIOTIS, IORDANIS (Greece b. 1956) | Red Square on Light Blue Background 2004 | RouI2004squa |
| ROUSSOPOULOU, LEA (Greece b. 1949) | Stele 2004 | RouL2004stel |
| " | Orderly Ordeal 2008 | RouL2008orde |
| " | Synthesis 2009 | RouL2009synt |
| RUBELLIN, ALPHONSE (France) | View of Center of Smyrna ca. 1880 | RubA1880smyr |
| " | Mount Pagus in Smyrna ca. 1880 | RubA1880pagu |
| " | Quay at Smyrna #1 ca. 1880 | RubA1880qua1 |
| " | Quay at Smyrna #2 ca. 1880 | RubA1880qua2 |
| " | Port at Smyrna ca. 1880 | RubA1880port |
| " | View of Gulf of Smyrna ca. 1880 | RubA1880gulf |
| " | Village in Magnesia ca. 1880 | RubA1880magn |
| " | Aqueduct at "Paradise" of Smyrna ca. 1880 | RubA1880para |
| " | Aqueduct of Saint Anne ca. 1880 | RubA1880anne |
| " | Aqueduct and Castle at Ephesus ca. 1880 | RubA1880aque |
| " | Saint Luke's Tomb at Ephesus ca. 1880 | RubA1880luke |
| " | Khan (Turkish Inn) ca. 1880 | RubA1880khan |
| " | Camels at Water ca. 1880 | RubA1880came |
| " | Earthquake on Chios Island - 3 April 1881 | RubA1881chio |
| RUSSELL, JAMES (England) | Portrait of Gerassimos Vassiliades ca. 1925 | RusS1925vass |
| RUSSELL, JUDI (USA) | My Mother Takes My Wife's Side 1969 | RusJ1969side |