The males and, when available, females of six new species of the damselfly genus Nososticta are described from the upper Fly, Strickland, and Kikori River basins in southern Papua New Guinea. They are Nososticta caelestis sp. nov. (male holotype, 10-viii-2014), Nososticta chrismulleri sp. nov. (male holotype, 04-viii-2013), Nososticta makrodon sp. nov. (male holotype, 01-viii-2013), Nososticta megantereon sp. nov. (male holotype, 03-viii-2013, female described), Nososticta ovimacula sp. nov. (male holotype, 29-vii-2013, female described), and Nososticta paraconifera sp. nov. (male holotype, 02-viii-2013, female described).