This R package provides a programmatic interface to the Bacterial Diversity Metadatabase of the DSMZ (German Collection of Microorganisms and Cell Cultures). BacDiveR helps you improve your research on bacteria and archaea by providing access to "structured information on [...] their taxonomy, morphology, physiology, cultivation, geographic origin, application, interaction" and more (Söhngen et al. 2016). Specifically, you can: download the BacDive data you need for offline investigation, and document your searchers and downloads in .R scripts, .Rmd files, etc. Thus, BacDiveR can be the basis for a reproducible data analysis pipeline. See TIBHannover.GitHub.io/BacDiveR for more details, /news there for the changelog, and GitHub.com/TIBHannover/BacDiveR for the latest source code. It was also built to serve as a demonstration object during TIB's "FAIR Data & Software" workshop. BacDiveR 0.9.0 NEW API: The deprecations announced in v0.8.0 are now completed: The bd_retrieve() family of functions has replaced retrieve_data() and retrieve_search_results() has been renamed to bd_retrieve_by_search(), see #96. Please update scripts and other downstream code that use BacDiveR. purrr is no longer an imported / required dependency, but only suggested due to use in the introductory vignette, see #98.