| 82130 | Intellectual property rights, preparation of | |
| 91240 | Intelligence services, military | |
| 91240 | Intelligence, military, administrative services related to | |
| 48342 | Intensifiers, photographic, mixed or compounded in bulk or in small quantities, whether or not put up for retail sale | |
| 48342 | Intensifiers, photographic, not mixed or compounded, put up in measured portions or for for retail sale in a form ready for use | |
| 48110 | Intensifying screens, X-ray | |
| 47220 | Intercom systems for buildings | |
| 84110 | Interconnection services, telecommunications | |
| 81300 | Interdisciplinary research and experimental development services | |
| 91114 | Interdisciplinary research, administrative services related to | |
| 48253 | Interfacial tension-measuring instruments for liquids | |
| 48244 | Interference-measuring instruments for telephone installations | |
| 48265 | Interferometers for checking plane surfaces | |
| 48253 | Interferometers for measuring refractive indices | |
| 83410 | Interior decorating services | |
| 83410 | Interior decorating, drawing-up of designs for | |
| 83410 | Interior decorators, services of | |
| 83410 | Interior design services | |
| 54720 | Interior plaster work, construction of | |
| 83410 | Interior spaces, planning and designing of | |
| 54760 | Interior staircases, installation of | |
| 54720 | Interior stucco work, construction of | |
| 85330 | Interior walls, cleaning of | |
| 44917 | Interlacing machines for working plaiting materials | |
| 32600 | Interleaved carbon sets (stationery) | |
| 85990 | Intermediaries, business services of | |
| 97320 | Interment services | |
| 33420 | Intermixtures of propane and butane, liquefied | |
| 85210 | Internal investigation services | |
| 99000 | International organizations, services provided by | |
| 91230 | International peacekeeping services | |
| 84220 | Internet access service, broadband | |
| 84220 | Internet access service, mobile | |
| 84220 | Internet access service, narrowband | |
| 84220 | Internet access service, remote | |
| 84220 | Internet access, by cable | |
| 84220 | Internet access, dial-up | |
| 84220 | Internet access, DSL level service | |
| 84220 | Internet access, ISDN level service | |
| 84220 | Internet access, wireless | |