Acts of Accession are the following treaties of the European Union:
Acts of Accession of Denmark, Ireland and the United Kingdom, signed on 22 January 1972
Act of Accession of Greece, signed on 28 May 1979
Acts of Accession of Spain and Portugal, signed on 12 June 1985
Acts of Accession of Austria, Sweden and Finland, signed on 24 June 1994
Acts of Accession of Norway, signed on 22 January 1972 and on 24 June 1994, but not ratified by Norway