This is a list of international organizations based in Istanbul, Turkey.
List
| Organization | Acronym | Official website | Notes |
|---|---|---|---|
| Developing 8 | D-8 | developing8.org | General Secretariat |
| Islamic Conference Youth Forum for Dialogue and Cooperation | ICYF-DC | icyf-dc.org | An affiliated institution of the OIC. |
| Organization of the Black Sea Economic Cooperation | BSEC | bsec-organization.org | Permanent International Secretariat of the Organization of the Black Sea Economic Cooperation (BSEC PERMIS) |
| Organization of Turkic States | OTS | turkkon.org | General Secretariat |
| Research Centre for Islamic History, Art and Culture | IRCICA | ircica.org | A subsidiary organization of the OIC. |
| Standards and Metrology Institute for Islamic Countries | SMIIC | smiic.org | An affiliated institution of the OIC. |
| Support for Sustainable Communities | SSC | Non Profit Organization |