Four new species of the genusDiaphusare described. Three of these are in the subgeneric group with a suborbital luminous organ and are members of theD. fulgensspecies group with a raised AOa1photophore.D. impostorsp. nov. from the Indo‐West Pacific is most similar toD. aliciae, differing in lower gill raker count and smaller size.D. wisnerisp. nov. from north of Hawaii and south Pacific lacks a luminous scale at the PLO and has a lower gill raker count than similar species.D. korasp. nov. from north‐east of New Zealand has a large luminous scale at the PLO, and a longer Vn and lower gill raker counts than similar species.D. kapalaesp. nov. from the south‐western Pacific is most similar toD. splendidusandD. antonbruuni, from which it differs by the presence of an Ant, higher gill raker counts, and position of the VLO photophore.