Zygentoma is a small ancient order of primitive hexapods with over 500 described species, distributed worldwide. The original data about Bulgarian Zygentoma is scarce and refers to only four species: Atelura montana (Nicoletiidae), Coletina bulgarica (Nicoletiidae) (described from Bulgaria and known only from its first description), Ctenolepisma lineatum (Lepismatidae), and Neoasterolepisma balcanicum (Lepismatidae). In this paper, the fauna of Zygentoma from Bulgaria is reviewed and extended by new distributional data with the addition of four more species: Ctenolepisma calvum, C. ciliatum, C. longicaudatum, and Lepisma saccharinum. The newly established species are from the Lepismatidae family and are synanthropic, showing increased spreading trends in recent years, except the Ctenolepisma ciliatum, which is not synanthropic but in Bulgaria has been found only in the vicinity of human dwellings. The collected specimens were preserved in 70-80% ethanol and deposited in the collection of the Institute of Biodiversity and Ecosystem Research at the Bulgarian Academy of Sciences (IBER). This study is a part of the Project “Monitoring the effects of global climate changes through qualitative and quantitative analysis of model animal groups in selected corridors of thermophilic fauna penetration in Bulgaria” (funded by the National Science Fund of Bulgaria under Grant contract number KP-06-N61/6 – 14.12.2022).