Nuclear structure data for A = 63 nuclei available through August 1974 are compiled, adopted level and gamma-ray properties are presented. Where no additional data have been reported since the previous compilation (H. Verheul, Nuclear Data B2-3-31, 1967), only the values adopted in the latter are given. The compilation consists of three parts. The first gives a pictorial presentation of the bulk of the data, adopted decay schemes, and adopted level properties. The second, Summary Sheets, includes the adopted values with brief discussions of their origins and problems encountered in their derivation. The third, Data Sheets, includes tabulated data and references used in deriving the adopted level properties (except 63Co for which all data are included on the Summary Sheet). This section also contains the adopted energies, intensities, and normalization factors for the 63Zn and 63Ga decay schemes. Similar data for 63Co decay are given in the Summary Sheets.