| Number | The name of Protocol | City | Country | Date | Ratified by |
| CoP 1 |
| Baku | Azerbaijan | May 2007 |
|
| CoP 2 |
| Tehran | Iran | November 2008 |
|
| CoP 3 | The Protocol Concerning Regional Preparedness, Response and Co-operation in Combating Oil Pollution Incidents (“Aktau Protocol”) | Aktau | Kazakhstan | August 2011 | all Parties |
| CoP 4 | The Protocol for the Protection of the Caspian Sea against Pollution from Land-based Sources and Activities (“Moscow Protocol”) | Moscow | Russia | December 2012 | Azerbaijan, Iran and Turkmenistan |
| CoP 5 | The Protocol for the Conservation of Biological Diversity (“Ashgabat Protocol”) | Ashgabat | Turkmenistan | May 2014 | Turkmenistan |
| ECoP* | The Protocol on Environmental Impact Assessment in a Transboundary Context | Moscow | Russia | July 2018 | Azerbaijan |