The potter wasp genus Allorhynchium from Vietnam, with descriptions of three new species and a new country record (Hymenoptera, Vespidae, Eumeninae).

Species of the potter wasp genus Allorhynchium van der Vecht (Eumeninae: Odynerini) occurring in Vietnam are presented. Seven species have been recorded from Vietnam. Of them, three species are described as new to science: Allorhynchiumlatum Nguyen, Tran & MT Nguyen, sp. nov. , A.moerum Nguyen & AD Nguyen, sp. nov. , and A.setosum Nguyen & Engel, sp. nov. , and one species, A.argentatum (Fabricius, 1804), is recorded from Vietnam for the first time. An updated key to the Oriental species of the genus is presented.