| 54650 | Acoustic insulation | |
| 37990 | Acoustic mineral materials (excl. asbestos), and articles thereof | |
| 54790 | Acoustic panels, application of | |
| 54790 | Acoustic tiles, application of | |
| 71511 | Acquisitions, corporate, arrangement of | |
| 34170 | Acraldehyde | |
| 34170 | Acrolein | |
| 34170 | Acrylaldehyde | |
| 34790 | Acrylic polymers in liquid or paste form (incl. emulsions, dispersions and solutions in which the solvent does not exceed 50% by weight of the solution) | |
| 34790 | Acrylo-methacrylic copolymers in liquid or paste form (incl. emulsions, dispersions and solutions in which the solvent does not exceed 50% by weight of the solution) | |
| 34150 | Acrylonitrile (excl. acrylonitrile polymers and copolymers) | |
| 34790 | Acrylonitrile polymers, in primary forms | |
| 35250 | ACTH (hormone), not put up as medicaments | |
| 82400 | Acting as receiver in bankruptcy | |
| 82400 | Acting as trustee in bankruptcy | |
| 33690 | Actinium 228 (mesothorium II) | |
| 33690 | Actinium and its isotopes | |
| 48219 | Actinometers (excl. those consisting simply of two special thermometers combined) | |
| 48251 | Actinometers, consisting simply of two special thermometers combined | |
| 35250 | Actinomycetin, not put up as medicaments | |
| 35250 | Actinomycins, not put up as medicaments | |
| 48122 | Actinotherapy apparatus | |
| 88906 | Action figures manufacturing services | |
| 84391 | Action games, intended to be played on the Internet | |
| 83813 | Action photography services | |
| 38360 | Actions, piano | |
| 88427 | Activated carbon manufacturing services | |
| 96310 | Actors, services of | |
| 71630 | Actuarial services | |
| 71630 | Actuaries, services of | |
| 93199 | Acupuncture services | |
| 88421 | Acyclic and cyclic alcohols manufacturing services | |
| 88421 | Acyclic hydrocarbons manufacturing services | |
| 34150 | Acyclic monoamines and their salts | |
| 34150 | Acyclic polyamines and their salts | |
| 34139 | Acyclic terpene alcohols | |
| 35310 | Acyl aminopolyglycol ethers of alkylene oxide condensates | |
| 83131 | Adaptation of existing software | |
| 43240 | Adaptor check valve for use in conjunction with couplings, used where shut off is required both upstream and downstream when disconnected | |
| 47223 | Adaptors, channel-to-channel, for connecting two digital computer systems | |