19-23 January
| World Economic Forum Annual Meeting 2026 | Davos, Graubunden
Switzerland | Secretariat |
| 26-27 January | High Level Preparatory meeting for the UN Water Conference | Dakar, Senegal | Secretariat |
| 3-8 February | 12th Session of the Plenary of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES 12) | Manchester, United Kingdom | Secretariat
CEESP |
7 February
| Third part of the fifth session of the Intergovernmental Negotiating Committee to develop an international legally binding instrument on plastic pollution, including in the marine environment (INC-5.3) | Geneva, Switzerland | Secretariat |
| 16-19 February | Sixth Meeting of the CBD Subsidiary Body on Implementation (SBI-6) | Rome, Italy | Secretariat |
| 24-26 February | 2nd meeting of the open-ended intergovernmental expert group on crimes that affect the environment | Vienna, Austria | Secretariat |
| 3 March | World Wildlife Day | Global | |
| 9 – 20 March | 70th Session of the UN Commission on the Status of Women | New York, USA | Secretariat |
| 9-20 March | 31st Session of the International
Seabed Authority Assembly and
Council (Part 1) | Kingston, Jamaica | Secretariat |
| 23-28 March | 15th meeting of the Conference of the Parties to the Convention on Migratory Species (CMS COP15) | Campo Grande, Brazil | WCS |
| 23 March – 2 April | BBNJ PrepCom III | New York, USA | |
| 13-19 April | World Bank IMF Spring Meetings | Washington DC | |
| 25-30 April | 15th UN Crime Congress | Abu Dhabi, UAE | Secretariat |
| 11-15 May | 21st session of the UN Forum on Forests (UNFF 21) | New York, USA | Secretariat |
| 11-21 May | 48th Antarctic Treaty Consultative Meeting (ATCM) and 28th Meeting of the Committee for Environmental Protection (CEP) | Hiroshima, Japan | Secretariat |
| 19 – 23 May | 34th Session of Commission on
Crime Prevention and Criminal Justice (CCPCJ) | Vienna, Austria | WCS |
| 1-5 June | 71st Meeting of the GEF Council and 8th GEF Assembly | Samarkand, Uzbekistan | Secretariat |
| 1-5 June | 35th Session of Commission on Crime Prevention and Criminal Justice (CCPCJ) | Vienna, Austria | |
| 8-18 June | 64th Sessions of the UNFCCC Subsidiary Bodies | Bonn, Germany | WCS |
| 9-19 July | 48th session of the World Heritage Committee | Busan, Republic of Korea | Secretariat |
| 15-26 June | G7 Summit | Evian, France | |
| 6-15 July | High-level Political Forum on Sustainable Development (HLPF) 2026 | New York, USA | Secretariat |
| 13-31 July | 31st Session of the International Seabed Authority Assembly and Council (Part II) | Kingston, Jamaica | |
| 27 July – 1 August | CBD SBSTTA28 | Nairobi, Kenya | Secretariat |
| 4-12 August | Seventh Meeting of the CBD Subsidiary Body on Implementation (SBI7) | Nairobi, Kenya | Secretariat |
| 17-28 August | 17th session of the Conference of the Parties to the UN Convention to Combat Desertification (UNCCD COP 17) | Ulaanbaatar, Mongolia | Secretariat |
| 21-25 September | UN High Level Week (UNGA81) | New York, USA | Secretariat |
| 21-25 September | 13th World Environmental Education Congress | Perth, Australia | CEC |
| 28 September – 3 October | 70th Meeting of the International Whaling Commission (IWC70) | Hobart, Australia | |
| 19-23 October | UNTOC COP 13 | Vienna, Austria | Secretariat |
| 19-30 October | UN Biodiversity Conference (COP 17) | Yerevan, Armenia | Secretariat |
| 20-31 October | Annual meeting for the Commission for the Conservation of Antarctica Living Marine Resources (CCAMLR) | Hobart, Tasmania, Australia | Secretariat |
| 9-20 November | 2026 UN Climate Change Conference (UNFCCC COP31) | Antalya, Turkey | Secretariat |
| 2-4 December | 2026 UN Water Conference | Abu Dhabi, UAE TBC | |
| 8 – 12 December | UNEA-7 | Nairobi, Kenya | |
| 14-15 December | G20 Summit | Miami, USA | |
