The 2021 Belgium 2 euro commemorative coin marks the centenary of the Belgian-Luxembourg Economic Union, a landmark agreement that fostered deep cooperation between the two nations. The national side features the effigies of King Philippe of Belgium and Grand Duke Henri of Luxembourg, positioned in profile to symbolise the enduring partnership and shared economic interests of their respective countries. Surrounding the portraits are the names of both nations in their official languages, alongside the dates 1921 and 2021, which denote the hundred-year anniversary of this collaborative union. This design reflects the historical commitment to regional stability and prosperity that has defined the relationship between Belgium and Luxembourg since the early twentieth century. This coin was issued in 2021 with a mintage of 150,000 pieces.