The present collection of materials on the Provisional Application of Treaties has been prepared on the recommendation of the International Law Commission, as endorsed by the General Assembly of the United Nations in resolution 76/113 of 19 December 2021, that a volume of the United Nations Legislative Series be prepared compiling the practice of States and international organizations in the provisional application of treaties, as furnished by the latter over the years, together with other materials relevant to the topic. Part One provides information received from States and international organizations about their practice in connection with the provisional application of treaties. Part two reproduces the Guide to Provisional Application of Treaties, and the accompanying commentaries, as adopted by the International Law Commission, as well as General Assembly resolution 76/113. Part Three reproduces three studies prepared by the United Nations Secretariat for the consideration of the International Law Commission during its work on the topic, as well as a bibliography.