| 82130 | Intellectual property rights, preparation of | |
| 91240 | Intelligence services, military | |
| 91240 | Intelligence, military, administrative services related to | |
| 48110 | Intensifying screens, X-ray | |
| 47223 | Intercom systems for buildings | |
| 84110 | Interconnection services, telecommunications | |
| 81300 | Interdisciplinary research and experimental development services | |
| 91114 | Interdisciplinary research, administrative services related to | |
| 88741 | Interface cards (sound cards, video cards, controllers, network cards, modems) manufacturing services | |
| 48253 | Interfacial tension-measuring instruments for liquids | |
| 48244 | Interference-measuring instruments for telephone installations | |
| 48269 | Interferometers for checking plane surfaces | |
| 48253 | Interferometers for measuring refractive indices | |
| 83911 | Interior decorating services | |
| 83911 | Interior decorating, drawing-up of designs for | |
| 83911 | Interior decorators, services of | |
| 83911 | Interior design services | |
| 54720 | Interior plaster work, construction of | |
| 83911 | Interior spaces, planning and designing of | |
| 54760 | Interior staircases, installation of | |
| 54720 | Interior stucco work, construction of | |
| 85330 | Interior walls, cleaning of | |
| 44919 | Interlacing machines for working plaiting materials | |
| 32700 | Interleaved carbon sets (stationery) | |
| 85999 | Intermediaries, business services of | |
| 97320 | Interment services | |
| 33420 | Intermixtures of propane and butane, liquefied | |
| 88761 | Internal combustion piston engines (excluding motor vehicle, aircraft and cycle propulsion engines) manufacturing services | |
| 85210 | Internal investigation services | |
| 64244 | International air taxi services by helicopters | |
| 64244 | International air transport services of passengers, non-scheduled | |
| 99000 | International organizations, services provided by | |
| 91230 | International peacekeeping services | |
| 84222 | Internet access service, broadband | |
| 84222 | Internet access service, mobile, broad-band | |
| 84221 | Internet access service, mobile, narrow-band | |
| 84221 | Internet access service, narrowband | |
| 84222 | Internet access service, remote, broad-band | |
| 84221 | Internet access service, remote, narrow-band | |
| 84222 | Internet access, by cable | |