This compilation of nuclear reaction energies was undertaken to provide a systematic and comprehensive survey of the present state of our experimental knowledge of the energy released in nuclear reactions. Table I also affords convenient reference to the large number of experimental results scattered throughout the literature. Somewhat similar tables have appeared previously;(1,2) in view of the rapid accumulation of new results, an up-to-date revision is felt to serve a useful purpose. ; © 1954 by The American Physical Society. Assisted by the joint program of the U.S. Office of Naval Research and the U.S. Atomic Energy Commission. Prepared at the suggestion of the Subcommittee on Nuclear Constants of the Committee on Nuclear Science of the National Research Council as part of a program on the compilation of experimental data relating to atomic masses. Subcommittee members: T.P. Kohman, chairman; W. Whaling, vice-chairman; H.E. Duckworth; L.G. Elliott; G. Friedlander; A.O.C. Neir; I. Perlman; W.H. Sullivan; and K. Way.