Listed below are the legal opinions indicating the title, the date and the possible presence of other kinds of documents. The attribution to Cassese is only certain where it is clearly specified.

- "Intervento pronunciato dal prof. A. Cassese nella commissione dei diritti dell’uomo sulla questione del Cile. Ginevra", 25 Febbraio 1975.
- "Customary International Law on dual nationality". Legal opinion by Antonio Cassese, Professor of International Law, University of Florence, 10 October 1983.
- "The international character of the Iran-U.S. claims tribunal. Legal Opinion by Antonio Cassese, Professor of International Law, University of Florence, 14 October 1983.
- "Research opinion on the legal issues raised by the 'Important Caveat' laid down in the A/18 Decision", Antonio Cassese, 6 March 1990.
- "Problemi di costituzionalità posti dal recepimento nell’ordinamento italiano della Decisione quadro del Consiglio dell’UE del 13 giugno 2002, sul mandato di arresto europeo", (IT). A letter from Gaetano Pecorella
- "Request for an expert opinion to A. Cassese for the Special Court for Sierra Leone", March 2003, with a document attached.
- Comments on the "Serbian Draft Law on Organization and Jurisdiction of Government Authorities in Prosecuting Persons Guilty of War Crimes", 3 May 2003. The file also includes correspondence with Joanna Salsbury, Mark Ellis, Philip Tahmindjis and a document of OSCE.
- Comments on the ICC document on "Measures available to the ICC to reduce the length of trials", 28 February 2003, (EN). The file also includes correspondence with Bruno Cathala, Salvatore […], and a confidential document entitled Measures available to the ICC to reduce the length of trials.
- "Bosnia and Herzegovina. Opinion on the possible retroactive application of some provisions of the new Criminal Code of Bosnia and Herzegovina by Professor Antonio Cassese, Department of Studies on the State, University of Florence, Italy", 5 June 2003 (Council of Europe, Strasbourg), (EN). Correspondence with R. Lamponi.

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