- Agreement Governing the Activities of States on the Moon and Other Celestial Bodies http://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/intromoon-agreement.html, 5 December of 1979
- Convention for the Establishment of a European Space Agency https://esamultimedia.esa.int/docs/LEX-L/ESA-Convention/SP-1317_EN.pdf, adopted on 30 May of 1975
- Convention on Registration of Objects Launched into Outer Space http://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/introregistration-convention.html, adopted on 12 November of 1974
- Convention on International Liability for Damage Caused by Space Objects http://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/introliability-convention.html, adopted on 29 November of 1971, and Notice no 55/2019https://www.anacom.pt/render.jsp?contentId=1479981, published on 17 July, which makes the deposit of the instrument of ratification by Portugal public.
- Agreement on the Rescue of Astronauts, the Return of Astronauts and the Return of Objects Launched into Outer Space http://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/introrescueagreement.html, 22 April of 1968
- Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies http://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/introouterspacetreaty.html, 27 January of 1967