Here we describe 21 new species of Braconidae in the subfamily Euphorinae from five different tribes: Euphorini: Leiophron agovauae n. sp., Leiophron anthoferi n. sp., Leiophron barbarae n. sp., Leiophron chevalieri n. sp., Leiophron diluae n. sp., Leiophron gewai n. sp., Leiophron keltimi n. sp., Leiophron kepai n. sp., Leiophron lilipi n. sp., Leiophron mellifacialis n. sp., Leiophron pascali n. sp., Leiophron tulai n. sp., Leiophron umai n. sp., Leiophron winckleriae sp.n., Peristenus montwilhelmi n. sp., Peristenus quadriplex n. sp.; Syntretini: Syntretus amber n. sp.; Townesilitini: Streblocera rugosa n. sp., Streblocera semirugosa n. sp.; Perilitini: Microctonus madang n. sp.; and Meteorini: Meteorus braeti n. sp. The descriptions are based on distinct morphological characters supplemented with molecular data. We also present genetic sequences for three Meteorus species (Meteorus achterbergi, Meteorus obscurus, Meteorus tarius) previously described by Huddleston, 1983. Finally, an identification key to the Papua New Guinean species of the genus Leiophron is provided.