| 34250 | Aurous oxide | |
| 71553 | Authorization of financial transactions | |
| 71620 | Authorizing payment of insurance claims | |
| 96320 | Authors, composers, sculptors and other artists, except performing artists, services of | |
| 96320 | Authors, services of | |
| 87141 | Auto body repair and related services | |
| 89410 | Auto parts, recycling of | |
| 43911 | Autoclaves, industrial or laboratory (excl. sterilizers) | |
| 48212 | Autographs (instruments) | |
| 38999 | Automata for shop-window dressing | |
| 85400 | Automated packaging services | |
| 84131 | Automatic mobile telephony services | |
| 44180 | Automatic poultry pluckers (excl. for industrial use) | |
| 45290 | Automatic spacing devices for typewriters or accounting machines | |
| 45110 | Automatic typewriters | |
| 45110 | Automatic typewriters with limited capacity memory, able to memorize, correct and retype texts automatically | |
| 45110 | Automatic typewriters with perforated paper band for typing a stock paragraph or a complete stock letter | |
| 83393 | Automation of industrial processes, the, corrosion control programmes for | |
| 83343 | Automation of industrial processes, the, electrical engineering design services for | |
| 83333 | Automation of industrial processes, the, electrical installation appraisal of | |
| 83333 | Automation of industrial processes, the, engineering advisory and pre-design services for | |
| 83393 | Automation of industrial processes, the, geotechnical engineering services for | |
| 83393 | Automation of industrial processes, the, groundwater assessment for | |
| 83313 | Automation of industrial processes, the, integrated engineering services for | |
| 83343 | Automation of industrial processes, the, mechanical engineering design services for | |
| 83333 | Automation of industrial processes, the, mechanical installation appraisal of | |
| 83393 | Automation of industrial processes, the, other engineering services for | |
| 83323 | Automation of industrial processes, the, project management services concerning | |
| 83343 | Automation of industrial processes, the, specialty engineering design services for | |
| 83343 | Automation of industrial processes, the, structural engineering design services for | |
| 83393 | Automation of industrial processes, the, structural failure investigation of | |
| 83333 | Automation of industrial processes, the, structural installation appraisal of | |
| 83353 | Automation of industrial processes, the, technical inspection services during | |
| 83393 | Automation of industrial processes, the, undertaking contamination studies of | |
| 83333 | Automation of industrial processes, the, undertaking environmental impact studies of | |
| 83333 | Automation of industrial processes, the, undertaking project impact studies of | |
| 83333 | Automation of industrial processes, the, undertaking technical feasibility studies of | |
| Automobile (see also under Motor vehicle) | |
| 38540 | Automobile model kits | |
| 87141 | Automobile repair | |