- Institute of International Relations of Moldova DEQARINST3224 MD0025 Institutul de Relații Internaționale din Moldova Chişinău (Moldova)
- Institute of Mechanics (Bulgarian Academy of Sciences) DEQARINST6571 BG0092 Институт по механика Sofia (Bulgaria)
- Institute of Molecular Biology “Acad. Roumen Tsanev” (Bulgarian Academy of Sciences) DEQARINST6574 BG0095 Институт по молекулярна биология “Академик Румен Цанев” Sofia (Bulgaria)
- Institute of Neurobiology (Bulgarian Academy of Sciences) DEQARINST6575 BG0096 Институт по невробиология Sofia (Bulgaria)
- Institute of Plant Physiology and Genetics (Bulgarian Academy of Sciences) DEQARINST6581 BG0102 Институт по физиология на растенията и генетика Sofia (Bulgaria)
- Institute of Robotics “Saint Apostle and Gospeller Mathew” (Bulgarian Academy of Sciences) DEQARINST6584 BG0105 Институт по роботика „Св. Ап. и Ев. Матей” Sofia (Bulgaria)
- Institute of Technology, Carlow DEQARINST1367 IE0015 Carlow (Ireland)
- Institute of Technology, Sligo DEQARINST1368 IE0016 Sligo (Ireland)
- Institute of Theology of the Estonian Evangelical Lutheran Church DEQARINST0769 EE0032 EELK Usuteaduse Instituut Tallinn (Estonia)
- Institution "Institute of Reproductive Medicine" DEQARINST7297 Учреждение "Институт Репродуктивной Медицины" Almaty (Kazakhstan)
- Instituto de Estudos Superiores de Fafe DEQARINST4364 PT0089 Escola Superior de Educação de Fafe Medelo (Portugal)
- Instituto de Estudos Superiores Militares DEQARINST5231 PT0813 Lisboa (Portugal)
- Instituto Politécnico da Lusofonia DEQARINST7270 PT0150 Lisboa (Portugal)
- Instituto Politécnico Jean Piaget do Norte DEQARINST7764 PT0152 Lisboa (Portugal)
- Instituto Politécnico Jean Piaget do Sul DEQARINST7269 PT0149 Almada (Portugal)
- Instituto Superior D. Dinis da Marinha Grande DEQARINST2179 PT0120 Instituto Superior D. Dinis Marinha Grande (Portugal)
- Instituto Superior de Ciências Educativas de Felgueiras DEQARINST4837 PT0126 Instituto Superior de Ciências Educativas do Douro Felgueiras (Portugal)
- Instituto Superior de Comunicação Empresarial DEQARINST4823 PT0054 Lisboa (Portugal)
- Instituto Superior de Saúde do Alto Ave DEQARINST4838 PT0133 ISAVE - Instituto Superior de Saúde Amares (Portugal)
- Institutul Teologic Creştin După Evanghelie "Timotheus" Din Bucureşti DEQARINST5204 RO0103 Bucharest (Romania)