The simple and coincidence spectra of gamma radiation accompanying the decay of155Dy were measured with Ge(Li) and scintillation detectors. The source was obtained as a daughter product of155Ho. The intensity or the upper limit of intensity were determined for all, and the multipolarity for most of the observed transitions. The coincidence measurements served as a basis for the introduction of new levels at 250, 1062, 1068, (1494) and 1638 keV, and as a proof of the existence of the 891, 1155, 1665 and 1749 keV levels proposed earlier. © 1969 Academia, nakladatelství Československé akademie věd.