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The reviews of the status of nuclear power and research reactors in the world show that the number of reactor units in shutdown status is growing rapidly. This is a strong indication that decommissioning methodologies will need to be developed and applied in the near future. In view of this situation the International Nuclear Data Committee has recommended to the Nuclear Data Section of the IAEA to convene a meeting to discuss nuclear data requirements for fission reactor decommissioning. Such an Advisory Group Meeting was organized in Vienna from 7 to 11 September 1992. 13 participants from 8 Member States and 2 international organizations have reviewed the status of the nuclear data libraries and computer codes used to calculate the radioactive inventory in the reactor unit components for the decommissioning purposes. Nuclides and nuclear reactions important for determination of the radiation fields during decommissioning and for the final disposal of radioactive waste from the decommissioned units were identified. Accuracy requirements for the relevant nuclear data were considered. The present publication contains the texts of the reports by the participants and their recommendations to the Nuclear Data Section of the IAEA. Printed by the IAEA in Vienn