| INTERAUTOMATION Deutschland GmbH | Berlin |
| Interbytes | Hesse |
| InterCard AG Informationssysteme | Baden-Württemberg |
| Interchip AG | Bavaria |
| intercoaster oHG | Hesse |
| InterComponentWare AG | Baden-Württemberg |
| Interconsult Unternehmensberatungs-GmbH | |
| InterFace AG | Bavaria |
| Interface Medien GmbH | North Rhine-Westphalia |
| Interface Systems GmbH | |
| Interfaceforce e.K. | Bavaria |
| Interflex | Baden-Württemberg |
| Interiorsphere GmbH | Bavaria |
| Interlogue | Berlin |
| Interloom GmbH | |
| Interlutions GmbH | North Rhine-Westphalia |
| Intermedia Softwarelösungen GmbH & Co. KG | Baden-Württemberg |
| INTERMEDIA Vermögensverwaltungs GmbH | |
| International Audio Laboratories Erlangen | |
| International Business School of Service Management | Hamburg |
| International Conference on Machine Learning and Data Mining | |
| International Federation of Robotics | Hesse |
| International Institute of Public Finance e.V. | |
| International Joint Conferences on Artificial Intelligence | Baden-Württemberg |
| International Mathematical Union | Berlin |
| International Max Planck Research School for Computer Science | |
| International Neuroscience Institute® Hannover GmbH | |
| International PHP Conference | Bavaria |
| International School of New Media | |
| International Showtimes | |
| International Supercomputer Conference | Saxony |
| International Telecom Network Operation Services GmbH | North Rhine-Westphalia |
| International Union of Immunological Societies | Berlin |
| International University of Applied Sciences | Thuringia |
| Internationale Hochschule für Wirtschaft, Technik und Kultur gGmbH | |
| Internationale Kolleg für Kulturtechnikforschung und Medienphilosophie | |
| Internationale Psychoanalytische Universität Berlin | |
| Internationales Fachinstitut für Steuer– und Wirtschaftsrecht e.V. | |
| Internet & PC-Service Dorfi | Hesse |
| Internet AG | Hesse |
| Internet Consulting for Business GmbH | Bavaria |
| Internet Economy Foundation | |
| Internet Legion GmbH | |
| Internet Management Systems | Bremen |
| Internet Marketing Services GmbH | Lower Saxony |
| Internet of Things Conference | |
| Internet Partner IPR GmbH | North Rhine-Westphalia |
| Internet Service Stefan Schuster | Bavaria |
| Internet Technology Based Solutions GmbH | Baden-Württemberg |
| Internet und Design | North Rhine-Westphalia |