This is an introductory course in Public International Law (PIL) and European Union (EU) law designed primarily for those who have no previous knowledge of these subjects. The course provides a survey of PIL and EU law and aims at setting a foundation to study more specific areas of PIL and EU law as part of the Albany/Parma Summer Program, in particular those concerning sustainable development. The introductory topics to be covered will include: sources and subjects of public international law, the law of State responsibility, international disputes settlement, EU institutions and EU law-making.