Based on a series of specimens collected in Cambodia and Vietnam, this paper describes 3 new species of tube-nosed bats belonging to the Murina “suilla-group” (Vespertilionidae: Murininae). We provide detailed accounts of their external and craniodental morphology, including a suite of standard measurements, and compare the new taxa with all other members of the group currently recognized in Southeast Asia. The 1st new species was previously included in M. tubinaris (Scully, 1881) but is considered distinct due to differences in external and craniodental features. This new species is widespread in continental Southeast Asia and relatively well represented in museum collections, whereas the other new species are known only from a few specimens collected at scattered localities. The new taxa are known only from forested areas, which highlights the incompleteness of existing knowledge and strong potential for further discoveries in the region.