This paper introduces the project “Belgian Historical Gazetteer”. Started in November 2022, this project will last two years. It is hosted at the University of Antwerp, financed by CLARIAH-VL (2021-2025), and undertaken in liaison with the Belgian National Geographical Institute (IGN/NGI). The aim of this project is to set up a historical gazetteer of toponyms for the whole present-day territory of Belgium, in order to provide researchers with a collection of data that 1) does not stop at Belgian provincial borders and which 2) goes beyond the level of municipalities – such tool does not exist yet. This paper will present the methodology used to build the gazetteer as well as the project planning and its expected outcomes.