For more than 60 years, the mesopelagic liparid genus Psednos was known from the holotype and paratype of a single species collected off South Africa and described in 1927. Over the last decade, examination of material from collections around the world has revealed specimens from all oceans except the South Atlantic. In this paper, we describe 10 more species of the genus from the north Atlantic and north and south Pacific Oceans. In addition, we partially describe, but do not name, three previously unknown species of which we have specimens in very poor condition and provide a provisional key to all known species. The new taxa bring the number of known Psednos species to more than 25.