The wasp genus Psenulus is the most diverse genus of the family Psenidae in the superfamily Apoidea, with its diversity peaking in the Oriental realm. Six species of the genus are here recorded for the first time from the Hong Kong SAR. Three of these, Psenulus ephippiussp. nov., Psenulus gibbussp. nov. and Psenulus pallenssp. nov. are described as new to science. An identification key, figures for all taxa recorded in Hong Kong and phenology of five of the six species are also provided.