Monitoring of Oak processionary larvae (Thaumetopoea processionea) in the province of East Flanders, Belgium is a historical occurrence dataset published by the Province East Flanders (Belgium). The dataset is published as a standardized Darwin Core Archive and includes for each occurrence record an occurrenceID, date, location, quantification where available and scientific name. Issues with the dataset can be reported at https://github.com/inbo/data-publication/issues We have released this dataset to the public domain under a Creative Commons Attribution License. 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.