[en] The Chalk River Symposium on Inelastic Scattering of Neutrons in Solids and Liquids was the International Atomic Energy Agency's second symposium held on this subject. The previous one was held in 1960 in Vienna and the very first international meeting in'this field took place in 1957 in Stockholm. At the Stockholm meeting only 11 papers from six countries were presented; this was ihe very beginning of a rapidly developing new branch of physics. At the Vienna Symposium there were 50 papers from 12 countries. At Chalk River 67 papers from 13 countries and three international organizations, the European Atomic Energy Community, the Joint Institute for Nuclear Research and the International Atomic Energy Agency, were presented and discussed. In several other countries, either research in this field has already begun or preparations to start it are under way. This is an indication that the interest in using inelastic scattering of neutrons as a method to study the internal dynamics of solids, liquids and molecules is continuously increasing. On the other hand, a deeper knowledge of the dynamic properties of moderators plays an important role in the understanding of the process of thermalization of neutrons. The latter study is of special importance in promoting advances in nuclear reactor technology. In the light of these developments the International Atomic Energy Agency, with the co-sponsorship of the United Nations Educational, Scienific and Cultural Organization, organized the Symposium at Chalk River rom 10 to 14 September 1962 on the generous invitation of the Government of Canada and Atomic Energy of Canada Limited. The proceedings now published contain all the 67 papers and the records of the discussions. The Proceedings of the Symposium on Inelastic Scattering of Neutrons in Solids and Liquids consist of the full texts of the papers accepted, in the original language in which they were submitted, together with abstracts of these papers in English, French, Russian and Spanish, and a record in English of the discussions held during the Symposium in connection with the orally-presented summaries of the papers. The papers have been grouped for the Proceedings in a similar way as for the Symposium. The discussions were edited as little as possible but full use was made of the forms ''Participants' Contributions'' to Discussions'' which were completed by the participants themselves. Nevertheless, mainly because the discussion was often so lively that occasionally speakers did not use their microphones, some parts of the discussions have been lost for the Proceedings. It also may happen that the published records contain some inaccuracies due to the fact that in speeding up publication it was not possible to ask the participants to verify their remarks in the proof stage. It was noted at the Symposium and can easily be seen from the papers that various authors have used different symbols for the same quantity or function, e. g. for the momentum transfer the symbols Q, Κ, κ may be found. In this connection it should be mentioned that no attempt has been made to standardize notations.