| 38999 | Ambroid, worked | |
| 93192 | Ambulance services | |
| 93192 | Ambulance, transport of patients by | |
| 49113 | Ambulances, motorized | |
| 33690 | Americium and its isotopes | |
| 16310 | Amethyst, unworked or simply sawn or roughly shaped, whether or not graded, not strung, mounted or set | |
| 38220 | Amethyst, worked other than simply sawn or roughly shaped, whether or not graded, not strung, mounted or set | |
| 34150 | Amfepramone (INN) | |
| 34150 | Amfepramone hydrochloride (INNM) | |
| 35220 | Amide derivatives of carboxylic acids (excl. acyclic amides and ureines) | |
| 34150 | Amide derivatives, organic-substituted, of inorganic acids (excl. carbonic acid) | |
| 35220 | Amide-function compounds of carbonic acid (excl. urea, acyclic amides and ureines) | |
| 35220 | Amides of hydroxynaphthoic acid | |
| 35220 | Amides, acylic, and their derivatives, and salts thereof | |
| 34250 | Amides, alkali | |
| 34150 | Amidines | |
| 35230 | Amidopyrin and its salts | |
| 34150 | Amino acids (excl. lysine, glutamic acid and amino acids containing more than one kind of oxygen function) and their salts, esters and substitution derivatives | |
| 34150 | 2-Amino-1-(3,4-dihydroxyphenyl)propan-1-ol | |
| 34160 | 3-Amino-1,2,4-triazole-5-thiol | |
| 34150 | 8-Amino-1-naphthol-3,6-disulphonic acid (H acid) and its salts | |
| 34150 | 7-Amino-1-naphthol-3-sulphonic acid (gamma acid) and its salts | |
| 34150 | 4-Amino-2-methyl-1-naphthol hydrochloride (Vitamin K5) | |
| 34150 | Aminoacetic acid and its salts and esters | |
| 34150 | 3'-Aminoacetophenone | |
| 34150 | Amino-alcohols (excl. those containing more than one kind of oxygen function), and their ethers and esters | |
| 34150 | Amino-aldehydes and their salts | |
| 34150 | Amino-anthraquinones | |
| 34150 | 4-Aminoazobenzene | |
| 34150 | Aminoazobenzenesulphonic acids | |
| 34150 | Aminoazonaphthalenes | |
| 34150 | Aminobenzaldehydes | |
| 35230 | p-Aminobenzenesulphonacetamide | |
| 35230 | p-Aminobenzenesulphonamide | |
| 35230 | p-Aminobenzenesulphonamidomethylpyrimidine | |
| 35230 | p-Aminobenzenesulphonamidopyridine | |
| 35230 | p-Aminobenzenesulphonamidopyrimidine | |
| 35230 | p-Aminobenzenesulphonamidothiazole | |
| 35230 | p-Aminobenzenesulphonamidothiourea | |
| 34150 | p-Aminobenzenesulphonic acid and its salts | |