Red Data Book of the Republic of Bulgaria (Bulgarian: Червена книга на Република България) consists of detailed publications that catalog the status of endangered and threatened species in the country.

These books play an important role in the conservation of biodiversity by identifying species at risk of extinction and documenting their current status.

Compiled by scientists, researchers, and conservationists, the Red Data Books are used by environmental organizations, policymakers, and academics to support and implement conservation initiatives.

Initially, the Red Data Book focused on global species, serving as a resource for identifying conservation priorities and guiding protective measures.

These national Red Data Books adapted the global framework to local contexts, offering understandings of regional species and their conservation status.