| Country | Date of Membership of the Economic Commission for Europe | Representative |
|---|---|---|
| Albania | 14 December 1955 | H.E. Ms. Ravesa LLESHI |
| Andorra | 28 July 1993 | H.E. Mr. Enric TARRADO VIVES |
| Armenia | 30 July 1993 1 | H.E. Mr. Andranik HOVHANNISYAN |
| Austria | 14 December 1955 | H.E. Ms. Elisabeth TICHY-FISSLBERGER |
| Azerbaijan | 30 July 1993 1 | H.E. Mr. Vaqif SADIQOV |
| Belarus | 28 March 1947 | H.E. Mr. Yury AMBRAZEVICH |
| Belgium | 28 March 1947 | H. E. Mr. Marc PECSTEEN DE BUYTSWERVE |
| Bosnia and Herzegovina | 22 May 1992 5 | H.E. Ms. Nermina KAPETANOVIĆ |
| Bulgaria | 14 December 1955 | H.E. Mr. Yuri BORISSOV STERK |
| Canada | 9 August 1973 | H.E. Ms. Leslie NORTON |
| Croatia | 22 May 1992 5 | H.E. Ms. Vesna BATISTIĆ KOS |
| Cyprus | 20 September 1960 |
Dr. Andrea PETRANYI, Chargé d'Affaires a.i. |
| Czech Republic | 28 March 1947 2 | H.E. Mr. Petr GAJDUSEK |
| Denmark | 28 March 1947 | H.E. Mr. Morten JESPERSEN |
| Estonia | 17 September 1991 | H.E. Ms. Katrin SAARSALU-LAYACHI |
| Finland | 14 December 1955 | H.E. Ms. Kirsti KAUPPI |
| France | 28 March 1947 | H. E. Mr. François RIVASSEAU |
| Georgia | 30 July 1993 3 | H.E. Mr. Aleksandre MAISURADZE |
| Germany | 18 September 1973 | H.E. Mr. Michael UNGERN-STERNBERG |
| Greece | 28 March 1947 | H.E. Mr. Panayotis STOURNARAS |
| Hungary | 14 December 1955 | H.E. Ms. Margit SZÜCS |
| Iceland | 28 March 1947 | H.E. Mr. Harald ASPELUND |
| Ireland | 14 December 1955 | H.E. Mr. Michael GAFFEY |
| Israel | 26 July 1991 4 | H.E. Ms. Meirav EILON SHAHAR |
| Italy | 14 December 1955 | H.E. Mr. Gian Lorenzo CORNADO |
| Kazakhstan | 31 Jan 1994 1 | H.E. Ms. Zhanar AITZHANOVA |
| Kyrgyzstan | 30 July 1993 1 | H.E. Mr. Daniiar MUKASHEV |
| Latvia | 17 September 1991 | H.E. Mr. Bahtijors HASANS |
| Liechtenstein | 18 September 1990 | H.E. Mr. Peter MATT |
| Lithuania | 17 September 1991 | Mr. Donatas TAMULAITIS, Chargé d'Affaires a.i. |
| Luxembourg | 28 March 1947 | H.E. Mr. Pierre-Louis LORENZ |
| Malta | 1 December 1964 | H.E. Mr. Christopher GRIMA |
| Monaco | 27 May 1993 | H.E. Ms. Carole LANTERI |
| Montenegro | 28 June 2006 5 6 | H.E. Ms. Slavica MILAČIĆ |
| Netherlands | 28 March 1947 | H.E. Ms. Monique VAN DAALEN |
| Norway | 28 March 1947 | H.E. Ms. Tine MØRCH SMITH |
| Poland | 28 March 1947 | H.E. Mr. Zbigniew CZECH |
| Portugal | 14 December 1955 | H.E. Mr. Rui MACIEIRA |
| Republic of Moldova | 2 March 1992 | H.E. Ms. Tatiana MOLCEAN |
| North Macedonia | 8 April 1993 5 | Ms. Teuta AGAI-DEMJAHA |
| Romania | 14 December 1955 | H.E. Mr. Adrian Cosmin VIERITA |
| Russian Federation | 28 March 1947 | H.E. Mr. Gennady GATILOV |
| San Marino | 30 July 1993 | H.E. Mr. Marcello BECCARI |
| Serbia | 1 November 2000 5 6 | H.E. Mr. Dejan ZLATANOVIĆ |
| Slovakia | 28 March 1947 2 | H.E. Mr. Juraj PODHORSKY |
| Slovenia | 22 May 1992 5 | H.E. Ms. Sabina STADLER REPNIK |
| Spain | 14 December 1955 | H.E. Ms. Aurora DIAZ-RATO REVUELTA |
| Sweden | 28 March 1947 | H.E. Ms. Anna JARDFELT |
| Switzerland | 24 March 1972 | H.E. Mr. Didier CHAMBOVEY |
| Tajikistan | 12 Dec 1994 1 | Mr. Jamshed KHAMIDOV |
| Turkey | 28 March 1947 | H.E. Mr. Sadik ARSLAN |
| Turkmenistan | 30 July 1993 1 | H.E. Mr. Atageldi HALJANOV |
| Ukraine | 28 March 1947 | Mr. Oleksandr KAPUSTIN, Chargé d'Affaires a.i. |
| United Kingdom of Great Britain and Northern Ireland | 28 March 1947 | H.E. Mr. Julian BRAITHWAITE |
| United States of America | 28 March 1947 | Mr. Howard T. SOLOMON, Chargé d'Affaires a.i. |
| Uzbekistan | 30 July 1993 1 | H.E. Mr. Ulugbek LAPASOV |
| (as of 21 July 2021) |
1 Member of the United Nations 2 March 1992.
2 Date refers to former Czechoslovakia; Czech Republic and Slovakia [re-]admitted to the United Nations 19 Jan 1993.
3 Member of the United Nations 31 July 1992.
4 Admitted to ECE on a temporary basis; member of the United Nations 11 May 1949.
5 The Socialist Federal Republic of Yugoslavia was an original Member of the United Nations, the Charter having been signed on its behalf on 26 June 1945 and ratified 19 October 1945, until its dissolution following the establishment and subsequent admission as new members of Bosnia and Herzegovina, the Republic of Croatia, the Republic of Slovenia, The former Yugoslav Republic of Macedonia, and the Federal Republic of Yugoslavia. The Federal Republic of Yugoslavia was admitted as a Member of the United Nations by General Assembly resolution A/RES/55/12 of 1 November 2000; this name was changed to “Serbia and Montenegro” on 4 February 2003.
6 Activated by the Declaration of Independence adopted by the National Assembly of Montenegro on 3 June 2006, the membership of the State Union Serbia and Montenegro in the United Nations (including all organs and organizations of the UN system) is continued by the Republic of Serbia. Montenegro was admitted as a member on 28 June 2006.