| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AUSTRIA | Signature | 28/06/1951 | |
| AUSTRIA | Ratification | 02/11/1955 | |
| AUSTRIA | Declaration | 15/10/1971 | |
| AUSTRIA | Denunciation | 15/10/1971 | |
| BELGIUM | Signature | 16/09/1950 | |
| BELGIUM | Ratification | 23/04/1954 | |
| FRANCE | Signature | 16/09/1950 | |
| GREECE | Accession | 01/07/1952 | |
| HOLY SEE | Accession | 01/10/1956 | |
| HUNGARY | Accession | 30/07/1962 | |
| ITALY | Accession | 30/03/1957 | |
| LUXEMBOURG | Signature | 16/09/1950 | |
| LUXEMBOURG | Ratification | 17/10/1952 | |
| MONTENEGRO | Succession | 23/10/2006 | 03/06/2006 |
| NETHERLANDS THE | Signature | 16/09/1950 | 04/12/1952 |
| POLAND | Accession | 29/10/1958 | |
| SPAIN | Accession | 09/06/1960 | |
| UNITED KINGDOM | Accession | 16/05/1966 | |
| YUGOSLAVIA | Signature | 16/09/1950 | |
| YUGOSLAVIA, FEDERAL REPUBLIC OF | Succession | 12/03/2001 | 27/04/1992 |