| Rufer, Adrian | Adrian Rufer | Director | 1974 | 1 | |
| Russell, Barbara | Barbara Russell | Director | 1999 | 1 | |
| Rybicki, Witold | Witold Rybicki | Director | 1988 | 1 | |
| Rungwald, Helge | Helge Rungwald | Director | 1957 - 1960 | 2 | |
| Rochaix, Francois | Francois Rochaix | Director | 1983 - 1996 | 4 | |
| Robinson, Mary B. | Mary B. Robinson | Director | 1993 | 1 | |
| Ramagli, Howard J. | Howard J. Ramagli | Director | 2005 | 1 | |
| Rosenzweig, Joshua D. | Joshua D. Rosenzweig | Director | 2000 | 1 | |
| Robinson, Lennox | Lennox Robinson | Director | 1923 - 1928 | 4 | |
| Ribeiro, Francisco | Francisco Ribeiro | Director | 1947 | 1 | |
| Romer, Dennis | Dennis Romer | Director | 2011 | 1 | |
| Račkys, Sigita | Sigita Račkys | Director | 2007 | 1 | |
| Ran, Li | Li Ran | Director | 2010 | 1 | |
| Ringland, Prof. Byron | Prof. Byron Ringland | Director | 1981 | 1 | |
| Rasmussen, August | August Rasmussen | Director | 1876 - 1879 | 4 | 1 |
| Rode-Ēbelings, Hermanis | Hermanis Rode-Ēbelings | Director | 1889 | 1 | |
| Rosen, Julius | Julius Rosen | Director | 1889 | 1 | |
| Ruederer, Josef | Josef Ruederer | Director | 1898 | 1 | |
| Reucker, Alfred | Alfred Reucker | Director | 1901 - 1906 | 3 | |
| Rémond, Fritz | Fritz Rémond | Director | 1911 | 1 | |
| Röbbeling, Hermann | Hermann Röbbeling | Director | 1915 | 1 | |
| Rampelmann, Adolph | Adolph Rampelmann | Director | 1920 | 1 | |
| Reich, Bernhard | Bernhard Reich | Director | 1922 | 1 | |
| Rausse, Dr. Hubert | Hubert Rausse (Dr. Hubert Rausse) | Director | 1928 | 1 | |
| Robert, Josef | Josef Robert | Director | 1928 | 1 | |
| Rose, Paul | Paul Rose | Director | 1933 - 1942 | 3 | |
| Rott, Adolf | Adolf Rott | Director | 1934 - 1965 | 4 | |
| Reichert, Franz | Franz Reichert | Director | 1946 - 1965 | 2 | |
| Raeck, Kurt | Kurt Raeck | Director | 1949 | 1 | |
| Roziskey, Miss | Miss Roziskey | Director | 1916 | 1 | |
| Rakitin, Jurij Ljvovič | Jurij Ljvovič Rakitin | Director | 1921 - 1951 | 4 | |
| Rýdl, Antonín | Antonín Rýdl | Director | 1922 | 1 | |
| Russell, Thomas | Thomas Russell | Director | 1926 | 1 | |
| Richter, Eberhard | Eberhard Richter | Director | 1974 | 1 | |
| Ribell, Frederik | Frederik Ribell | Director | 1974 - 1980 | 3 | |
| Rădulescu, V. | V. Rădulescu | Director | 1928 | 1 | |
| Ritzén, Linda | Linda Ritzén | Director | 2010 | 5 | |
| Roos, Staffan | Staffan Roos | Director | 1974 - 1975 | 2 | |
| Rogall, Hugo | Hugo Rogall | Director | 1900 | 2 | |
| Rahn, Hans, Julius | Hans Julius Rahn | Director | 1889 | 1 | |
| Röder, Michael | Michael Röder | Director | 1975 | 1 | |
| Rallis, Stelios | Stelios Rallis | Director | 1979 | 1 | |
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