Nesting biology of Auplopus sp. in Vietnam is presented. Nesting site of A. sp. was on the wall corners or on the foundation of a desert house. The nest was constructed with a single row or two rows of 3 - 6 exposed mud cells, one of which was open. Each closured cell was provisioned with a single prey spider whose legs were amputated. The prey spiders were immatures of a species of the genus Heteropoda, family Sparassidae. Developmental time of egg, larva, pre-pupa, pupa, and pre-adult was 6 - 7, 13 - 14, 5 - 7, 41 - 43, and 3 - 4 days, respectively. The duration of egg to adult development ranged from 68 to 75 days.