Diaemus youngii (Jentink, 1893) is a widespread species occurring from southern Mexico to northern Argentina. Along its distribution, however, this bat is rare to uncommon. Here, we report its record for the state of Goiás, central-western Brazil, based on a specimen found in the mammal collection of the Instituto Nacional da Mata Atlântica, former Museu de Biologia Professor Mello Leitão. Diaemus youngii is known from 129 unique localities, with 81 (over 62%) in Brazil, followed by Peru (7), Bolivia (6) and Venezuela (6). It is absent in the west of the Andes, southern Argentina, Uruguay, and Caribbean islands, except for Trinidad.