- IAESTE LC Bochum (International Association for the Exchange of Students for Technical Experience)
- ICAMS (Interdisciplinary Centre for Advanced Materials Simulation)
- ID Card
- IFHV (Institute for International Law of Peace and Armed Conflict)
- IFSC (Interfacial Systems Chemistry)
- IKGF (International Consortium “Dynamics in the History of Religions")
- Individual Research
- Infopoint (Building UV, HZO, and TUZ)
- Information Desks
- Information Security (Office of the Rectorate)
- Information Technology and Electronics (Faculty)
- Institute for Advanced Study in the Humanities (KWI)
- Institute for Diaspora and Genocide Studies (IDG)
- Institute for E-Business Security
- Institute for German Cultural Studies
- Institute for IT-Security (hgi)
- Institute of Intensive Language Training (LSI)
- Institutes
- Institutional Strategy
- inStudies
- Interdisciplinary Lectures
- Interdisciplinary Regional Studies, Centre for (ZEFIR)
- Interfacial Systems Chemistry (IFSC), Research Department
- International Faculty
- International Fair "Grenzenlos"
- International Graduate School of Neuroscience (ISGN)
- International Law of Peace and Armed Conflict (Institute)
- International Meeting Centre (Beckmann's Farm)
- International Office
- International Portal
- International Student Services (RUBiss)
- International Women's Studies (Marie Jahoda Visiting Chair)
- Internationalisation Strategy
- Internationalisation Task Force
- Internet for Students
- Introductory Classes
- Introductory Courses, Subject-specific
- Islamic Studies (and Oriental Studies)
- Isotope Laboratory (ZIL, RUBION)
- IT-Security, Institute for