| Ro - Rz | Nummer |
| Robinetin | 14 |
| Robinia pseudoacacia L. | |
| Robinie | # 227 ++ |
| Robinin | 16 |
| Rohkaffeestaub | 18 |
| Rohöl | 10 |
| Röhrling, Satans- | 16 |
| Rohrreinigungsmittel | 2 |
| Roli-cyclidin | 14 |
| Roli-tetra-cyclin | |
| Rongalit | 16 |
| Ronidazol | 16 / # (19c) |
| Roridin A | 14 |
| p-Rosanilin Hydrochlorid | 14 / 19a |
| Rosaramicin | 16 |
| Rosenlorbeer | xxx |
| Rosenöl | xxx |
| Rosmarin | Sehr selten 18 |
| Rosmarin-heide | 14 |
| Rosmarin-öl | xxx |
| Rosmarin-seidelbast | 14 / # 227 +++ |
| Rosmarinus officinalis | Sehr selten 18 |
| Roßkastanie, Gewöhnliche | # 227 (+) |
| Rot-2 G | 16 |
| Rotbuche | |
| Rötelritterling, Violetter | |
| Rotenon | 14 / 16 / # 21 Haut |
| Roter Phosphor | # 152 Info(!) |
| Rötling-Arten | 16 |
| Rottlerin | 14 |
| Roxarson | 14 / 12 |
| Rubeanwasserstoff | 16 |
| Rubidium | 2 / 12 |
| Rubidium-carbonat | 12 / 16 |
| Rubidium-chlorid | 11 / 12 |
| Rubidium-fluorid | 5 / 12 / # (19a) |
| Rubidium-hydroxid | 12 / 16 |
| Rubidium-iodid | 11 / 12 |
| Rubidium-nitrat | 11 / 12 / 13 |
| Rubidium-sulfat | 12 / 16 |
| Rubidomycin | 14 / 3 / 18 / # (19c) |
| Rubixanthin | 16 |
| Rubratoxin B | 14 / # (19b) |
| Ruchgras, Wohlriechendes | # 225 Sonne |
| Rückstände (Erdöl, Kohlenteer) | 10 / 19a |
| Rückstandsöle (Erdöl) | 10 |
| Ruelene | 16 / # 21 Haut |
| Ruhm(es)krone | # 227 ++ |
| Ruhrwurzel | 14 |
| Rumex acetosa | Gelegentlich 18 |
| Russula emetica | 16 |
| Russula foetens | |
| Ruta graveolens | # 42 Photo |
| Ruthenium | 12 |
| Ruthenium-(III)-chlorid Hydrat | 2 / 12 |
| Ruthenium-di-oxid Hydrat | |
| Ruthenium-(IV)-oxid Hydrat | |
| Rutin | xxx |
| Ryania | 14 |