The Non-validated red lists of Flanders, Belgium is a species checklist dataset published by the Research Institute for Nature and Forest (INBO) and described (v1.1) in Maes et al. 2019b (https://doi.org/10.3897/BDJ.7.e34089). It includes 3.161 taxa from 19 Flemish red lists that are considered non-validated, i.e. which did not use quantitative criteria and a representative sample of occurrences across all ecological regions in Flanders (Maes et al. 2015) for red list assessment. Here this compilation is published as a standardized Darwin Core Archive and includes for each taxon: the scientific name, higher classification (provided by the GBIF Backbone Taxonomy, https://doi.org/10.15468/39omei), stable taxon identifier and Dutch vernacular name (in the taxon core) and the red list category in Flanders as published, its IUCN equivalent and year of assessment (respectively in occurrenceRemarks, threatStatus and eventDate in the distribution extension). Issues with the dataset can be reported at: https://github.com/inbo/rl-flanders-checklist We have released this dataset to the public domain under a Creative Commons Zero waiver. We would appreciate it if you follow the INBO norms for data use (https://www.inbo.be/en/norms-data-use) when using the data. If you have any questions regarding this dataset, don't hesitate to contact us via the contact information provided in the metadata or via opendata@inbo.be.