Parc du Cinquantenaire or Jubelpark is a large public, urban park (30 hectares) in the easternmost part of the European Quarter in Brussels, Belgium.
Most buildings of the U-shaped complex which dominate the park were commissioned by King Leopold II and built for the 1880 National Exhibition commemorating the fiftieth anniversary of Belgian independence. The centrepiece triumphal arch was erected in 1905. The structures were built in iron, glass and stone, symbolising the economic and industrial performance of Belgium. The surrounding 30 hectare park esplanade was full of picturesque gardens, ponds and waterfalls. It housed several trade fairs, exhibitions and festivals at the beginning of the century. This settled however in 1930 when it was decided that Cinquantenaire would become a leisure park.