Member states
  1. 29/09/1954

    Twelve founding members

    The CERN convention was signed in 1953 by the 12…

    Know more
  2. 01/06/1959

    Austria joins

    Austria signed as a member state of CERN on 1…

    Know more
  3. 01/01/1961

    Spain joins

    From the minutes of the CERN council, dated 14…

    Know more
  4. 29/09/1961

    Yugoslavia quits

    On 29 September 1961, the Federal Republic of…

    Know more
  5. 31/12/1968

    Spain quits

    At the request of the Spanish government, Spanish…

    Know more
  6. 01/01/1983

    Spain rejoins

    The return to CERN as a member state in 1983…

    Know more
  7. 01/01/1986

    Portugal joins

    Portugal joined CERN as a member state in 1986.…

    Know more
  8. 01/01/1991

    Finland joins

    On 1 January 1991, Finland joined CERN as the…

    Know more
  9. 01/07/1991

    Poland joins

    The first contacts between Poland and CERN were…

    Know more
  10. 01/07/1992

    Hungary joins. So does the Czech and Slovak Federal Republic

    Hungary Hungary joined CERN in 1992, but…

    Know more
  11. 31/12/1992

    The Czech and Slovak Federal Republic ceases to exist

    By a letter dated 16 December 1992, the Permanent…

    Know more
  12. 01/07/1993

    The Czech Republic and the Slovak Republic join

    The Czech Republic joins Statement of the…

    Know more
  13. 11/06/1999

    Bulgaria joins

    Bulgaria became a full member state of CERN on 11…

    Know more
  14. 06/01/2014

    Israel joins

    From CERN press release dated 15 January 2014…

    Know more
  15. 17/07/2016

    Romania joins

    From CERN press release dated 17 July 2016: On…

    Know more