| Rh - Rn | Nummer |
| Rhabarber | 15 |
| Rhamnoxanthin | 16 |
| Rhamnus catharticus | |
| Rhamnus frangula | |
| Rhamnus purshianus | |
| Rhapon-tik-rhabarber | 15 |
| Rhein | 16 / 13 |
| Rhenium | 12 |
| Rhenium-carbonyl | |
| Rhenium-(III)-chlorid | 12 / 16 |
| Rhenium-deca-carbonyl | 12 |
| Rhenium-tri-chlorid | 12 / 16 |
| Rheum palmatum | 15 |
| Rheum rhaponticum | |
| Rhinanthin | 3a / 16 |
| Rhinanthus-Arten | 16 |
| Rhizopus stolonifer | xxx |
| Rhodallin | 14 |
| Rhodamin B, RED 213 | 16 / # (19c) / # 6 Augen |
| Rhodanin | 16 |
| Rhodan-wasserstoffsäure | 14 / 16 |
| Rhodan-wasserstoffsäure-Salze | |
| Rhodan-wasserstoffsäure-ethylester | 16 |
| Rhodium | 11 / # (19a) |
| Rhodium-(III)-chlorid Trihydrat | 11 / 18 / # (19a) / # 6 Augen |
| Rhodium-Verbindungen, anorganische | 12 / 18 / # (19a) |
| Rhododendron ferrugineum | 14 |
| Rhododendron chrysanthemum | |
| Rhododendron simsii | |
| Rhodophyllus-Arten | 16 |
| Rhodophyllus hirtipes | |
| Rhodotypos scandens | |
| Rhodoxanthin | |
| Rhoeadin | xxx |
| Rhothane | 14 / 18 / 19 |
| Rhus toxicodendron | 14 / stark 18 / # 46 Haut / # 227 +++ |
| Rhus typhina | 16 / sehr selten 18 |
| Riboflavin | 16 / 18 |
| Riboflavin-5-phosphat Natriumsalz Dihydrat | 16 |
| 2-β-D-Ribo-furanosyl-maleimid | 14 |
| Ricin | 9 / stark 18 / 19 |
| Ricinoleinsäure | 16 |
| Ricinolsäure | |
| Ricinusarten, Ricinussamen | 16 / stark 18 |
| Ricinus communis | Stark 18 |
| Riemenblatt | # 227 + |
| Riesen-Bärenklau | # 42 Photo |
| Riesen-Träuschling, Rotbrauner | 16 |
| Rifamid | 14 / 18 |
| Rifampicin | 14 / 3 / 18 |
| Rifampin | |
| Rifamycin - B | |
| Rifamycin - S | |
| Rifamycin - SV | |
| Rimsulfuron | 16 |
| Ringelblume | 18 |
| Rio Palisander | |
| Risperidon | xxx |
| Risspilz-Arten | 14 / # 227 ++ |
| Ritodrin | xxx |
| Ritterling-Arten | 16 |
| Rittersporn, Hoher | xxx |
| Ritterstern | # 227 ++ |
| Rizinus-proteine | 18 |